Configure bgp with load sharing

Hi,
We have 2 Lines to sprint on the same AS,
on our side we have 2 routers that running ebgp to sprint and ibgp between them.
now all the traffic go through one line only and if the primary line fail the traffic go through the backup.
we run eigrp on all our routers in all the sites and we have redestribute between bgp and eigrp also on the 2 routers that run ebgp to sprint.
we want to move to load sharing between those line base on sites , i mean some local soureces address will go through the backup line and the other go through the primary , same with the inbound traffic to those site&address .
what is the best way to do it, and how ?
Regards
Ronen.

you can only do load sharing. You cannot do load balancing because BGP selects only a single best
path to a destination among the BGP routes that are learned from the different ASs
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml

Similar Messages

MPLS Traffic Load Sharing

What is the best way to configure a load sharing policy from multiple CE "remotes" to two CE "hosts" in a MPLS network? Currently, all incoming traffic goes to only one host from the PE.

Hi,
you need to have a look at the complete routing architecture to understand possibilities/responsibilities.
Mainly load distribution for a single prefix can only occur, if more than one path to a destination is known. This however might not be given in the MPLS network. The underlying reason is that BGP will only send the best path in an update - but not all pathes a BGP speaker knows of (RFC mandates this).
As practically all larger BGP implementations use Route Reflectors, which are (RFC conforming) BGP speakers, they will only forward the best path to a destination. The result is:
IF more than one path to a destination network exists and is sent to the RR through different PE routers (with same RD) then only one path will be distributed to all other PE routers.
In this scenario load sharing for a single prefix can not occur, because only one routing table entry exists for this prefix in most if not all PE routers. All you can do is to try to load share by selecting different pathes for different destination prefixes by influencing routing metric. This way part of your traffic will go one way and part will take another path.
IF the SP however uses different RD values for every VRF and the proper "maximum-path" statements in MP-BGP, then load sharing per prefix can be achieved in the MPLS network. The customer however can not influence the SP setup.
Hope this Helps! Please rate all posts.
Regards, Martin

Hrsp load sharing

Hello,
If I have two nics on a server and two core switches running hrsp with load sharing. If I connect each nic to each core. So nic 1 goes to core switch 1 and nic 2 goes core switch 2. My question does hrsp load sharing let both nics send traffic or only one nic is receiving and other nic sending how does that work with packet flow. Also what happened if I team the nic cards?
Thanks,

Hello, what are your core switches? and how are you achieving load sharing? With the old HSRP (i.e. not advanced like N7K's or perhaps N5K's too) you have one active and one standby. So one of the core switches will always be an active gateway which will take the responsibility of routing traffic etc.. So this isn't really load-sharing. Unless you are load sharing several VLAN's to the server nics.
If you team the cards, in standard configuration, you will see mac flaps on the core switches, which isn't so good when forwarding traffic to the server vice versa.
hth.

BGP load sharing with bandwidth

We are running eBGP between two routers. We had a 250 M PVC between the two routers on OSM STM4 ATM interface. We need to increase the B/W between the two routers to 350M, but because there's a limitation on the PVC size for the OSM STM4 ATM card (Max. size of the PVC is 300M), so we created new PVC between the two routers on the same circuits (and of course the same interfaces). Now I need to enable the load sharing between the two routers taking the PVC B/W in consideration.. So I prepared this config, is it right and full? Or Am I missing anything here..
RouterA:
Router bgp 100
Neighbor 10.1.1.1 remote-as 200 (10.1.1.1 is loop back address fro Router B)
Neighbor 10.1.1.1 ebgp-multihop
bgp dmzlink-bw
neighbor 10.1.1.1 dmzlink-bw
neighbor 10.1.1.1 send-community both
maximum-paths ebgp 2
RouterB:
Router bgp 100
Neighbor 10.10.1.1 remote-as 200 (10.10.1.1 is loop back address fro Router A)
Neighbor 10.10.1.1 ebgp-multihop
neighbor 10.10.1.1 send-community both
bgp dmzlink-bw
neighbor 10.10.1.1 dmzlink-bw
maximum-paths ebgp 2

I implmented these changes but did not work, becuase the command neighbor 10.10.1.1 dmzlink-bw is not supported with multihop (Neighbor 10.10.1.1 ebgp-multihop).
I removed the loopback BGP neighbor and created 2 BGP neighbors with the directly connected interfaces IP's and applied same configuration and now it works fine.. Here's show Ip route (Ip's and AS numbers have been chnaged)
R1#sh ip ro 10.10.0.1
Routing entry for 10.10.0.0/20
Known via "bgp xxxxx", distance 20, metric 10
Tag xxxx, type external
Last update from x.x.x.x 00:00:24 ago
Routing Descriptor Blocks:
* x.x.x.x, from x.x.x.x, 00:00:24 ago
Route metric is 10, traffic share count is 240
AS Hops 1
Route tag xxxxx
y.y.y.y, from y.y.y.y, 00:00:24 ago
Route metric is 10, traffic share count is 83
AS Hops 1
Route tag xxxx
notice the traffic share count
traffic share count is 240 (for peer #1)
traffic share count is 83 (for peer # 2)
It's almost 3:1

MP-BGP and MPLS multipath load sharing

Hi,
I am trying to PoC MPLS multi path load sharing by using per-PE-per-VRF RDs in the network.
I have a simple lab setup with AS65000 which consists of SITE1 PE1&PE2 routers (10.250.0.101 and 10.250.0.102), route reflector RR in the middle (10.250.0.55) and SITE2 PE1&PE2 routers (10.250.0.201 and 10.250.0.202). PE routers only do iBGP peering with centralized route reflector and passing route to 10.1.1.0/24 prefix (learned from single CE router) with 100:1 and 100:2 RDs for specific VRF.
Route reflector gets routes with multiple RDs, makes copies of these routes in order to make local comparison to RD 55:55 configured, uses these routes and install multiple paths into its routing table (all PE routers and RR have "maximum-paths eibgp 4" configured):
RR#sh ip bgp vpnv4 all
BGP table version is 7, local router ID is 10.250.0.55
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network          Next Hop            Metric LocPrf Weight Path
Route Distinguisher: 55:55 (default for vrf VRF-A) VRF Router ID 10.250.0.55
* i10.1.1.0/24      10.250.0.102             0    100      0 65001 i
*>i                 10.250.0.101             0    100      0 65001 i
Route Distinguisher: 100:1
*>i10.1.1.0/24      10.250.0.101             0    100      0 65001 i
Route Distinguisher: 100:2
*>i10.1.1.0/24      10.250.0.102             0    100      0 65001 i
RR#sh ip route vrf VRF-A
<output omitted>
     10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
B       10.1.1.0/24 [200/0] via 10.250.0.102, 00:45:52
                          [200/0] via 10.250.0.101, 00:46:22
BUT, for some reason RR doest reflects routes with multiple RDs down to SITE2 PE1&PE2 - its own clients:
RR#sh ip bgp vpnv4 all neighbors 10.250.0.201 advertised-routes
Total number of prefixes 0
RR#sh ip bgp vpnv4 all neighbors 10.250.0.202 advertised-routes
Total number of prefixes 0
Here comes RR BGP configuration:
router bgp 65000
no synchronization
bgp router-id 10.250.0.55
bgp cluster-id 1.1.1.1
bgp log-neighbor-changes
neighbor 10.250.0.101 remote-as 65000
neighbor 10.250.0.101 update-source Loopback0
neighbor 10.250.0.101 route-reflector-client
neighbor 10.250.0.101 soft-reconfiguration inbound
neighbor 10.250.0.102 remote-as 65000
neighbor 10.250.0.102 update-source Loopback0
neighbor 10.250.0.102 route-reflector-client
neighbor 10.250.0.102 soft-reconfiguration inbound
neighbor 10.250.0.201 remote-as 65000
neighbor 10.250.0.201 update-source Loopback0
neighbor 10.250.0.201 route-reflector-client
neighbor 10.250.0.201 soft-reconfiguration inbound
neighbor 10.250.0.202 remote-as 65000
neighbor 10.250.0.202 update-source Loopback0
neighbor 10.250.0.202 route-reflector-client
neighbor 10.250.0.202 soft-reconfiguration inbound
no auto-summary
address-family vpnv4
neighbor 10.250.0.101 activate
neighbor 10.250.0.101 send-community both
neighbor 10.250.0.102 activate
neighbor 10.250.0.102 send-community both
neighbor 10.250.0.201 activate
neighbor 10.250.0.201 send-community both
neighbor 10.250.0.202 activate
neighbor 10.250.0.202 send-community both
exit-address-family
address-family ipv4 vrf VRF-A
maximum-paths eibgp 4
no synchronization
bgp router-id 10.250.0.55
network 10.255.1.1 mask 255.255.255.255
exit-address-family
SITE1 PE1 configuration:
router bgp 65000
no synchronization
bgp router-id 10.250.0.101
bgp log-neighbor-changes
neighbor 10.250.0.55 remote-as 65000
neighbor 10.250.0.55 update-source Loopback0
neighbor 10.250.0.55 soft-reconfiguration inbound
no auto-summary
address-family vpnv4
neighbor 10.250.0.55 activate
neighbor 10.250.0.55 send-community both
exit-address-family
address-family ipv4 vrf VRF-A
neighbor 10.1.101.2 remote-as 65001
neighbor 10.1.101.2 activate
neighbor 10.1.101.2 soft-reconfiguration inbound
maximum-paths eibgp 4
no synchronization
bgp router-id 10.250.0.101
exit-address-family
SITE1 PE2 configuration is similar to SITE1 PE1. They both do eBGP peering with dualhomed CE router in AS65001 which announces 10.1.1.0/24 prefix into VRF-A table.
My question is: clearly, the issue is that RR doesn't reflect any routes to its clients (SITE2 PE1&PE2) for 10.1.1.0/24 prefix with 100:1 and 100:2 RDs that dont match it's locally configured RD 55:55 for VRF-A, although they are present in its BGP/RIB tables and used for multipathing. Is this an expected behavior or some feature limitation for specific platform or IOS version? Currently, in this test lab setup I run IOS 12.4(24)T8 on all the devices.
Please, let me know if any further details are needed to get an idea of why this well known and widely used feature is not working correctly in my case. Thanks a lot!
Regards,
Sergey

Hi Ashish,
I tried to remove VRF and address family configurations completely from RR.
router bgp 65000
no synchronization
bgp router-id 10.250.0.55
bgp cluster-id 1.1.1.1
bgp log-neighbor-changes
neighbor 10.250.0.101 remote-as 65000
neighbor 10.250.0.101 update-source Loopback0
neighbor 10.250.0.101 route-reflector-client
neighbor 10.250.0.101 soft-reconfiguration inbound
neighbor 10.250.0.102 remote-as 65000
neighbor 10.250.0.102 update-source Loopback0
neighbor 10.250.0.102 route-reflector-client
neighbor 10.250.0.102 soft-reconfiguration inbound
neighbor 10.250.0.201 remote-as 65000
neighbor 10.250.0.201 update-source Loopback0
neighbor 10.250.0.201 route-reflector-client
neighbor 10.250.0.201 soft-reconfiguration inbound
neighbor 10.250.0.202 remote-as 65000
neighbor 10.250.0.202 update-source Loopback0
neighbor 10.250.0.202 route-reflector-client
neighbor 10.250.0.202 soft-reconfiguration inbound
no auto-summary
address-family vpnv4
neighbor 10.250.0.101 activate
neighbor 10.250.0.101 send-community both
neighbor 10.250.0.102 activate
neighbor 10.250.0.102 send-community both
neighbor 10.250.0.201 activate
neighbor 10.250.0.201 send-community both
neighbor 10.250.0.202 activate
neighbor 10.250.0.202 send-community both
exit-address-family
After this, RR doesn't accept any routes at all from S1PE1&S1PE2 routers, thus not reflecting any routes down to its clients S2PE1&S2PE2 as well:
S1PE1#sh ip bgp vpnv4 all
BGP table version is 6, local router ID is 10.250.0.101
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network          Next Hop            Metric LocPrf Weight Path
Route Distinguisher: 100:1 (default for vrf VRF-A) VRF Router ID 10.250.0.101
*> 10.1.1.0/24      10.1.101.2               0             0 65001 i
S1PE1#sh ip bgp vpnv4 all neighbors 10.250.0.55 advertised-routes
BGP table version is 6, local router ID is 10.250.0.101
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network          Next Hop            Metric LocPrf Weight Path
Route Distinguisher: 100:1 (default for vrf VRF-A) VRF Router ID 10.250.0.101
*> 10.1.1.0/24      10.1.101.2               0             0 65001 i
Total number of prefixes 1
S1PE2#sh ip bgp vpnv4 all
BGP table version is 6, local router ID is 10.250.0.102
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network          Next Hop            Metric LocPrf Weight Path
Route Distinguisher: 100:2 (default for vrf VRF-A) VRF Router ID 10.250.0.102
*> 10.1.1.0/24      10.1.201.2               0             0 65001 i
S1PE2#sh ip bgp vpnv4 all neighbors 10.250.0.55 advertised-routes
BGP table version is 6, local router ID is 10.250.0.102
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network          Next Hop            Metric LocPrf Weight Path
Route Distinguisher: 100:2 (default for vrf VRF-A) VRF Router ID 10.250.0.102
*> 10.1.1.0/24      10.1.201.2               0             0 65001 i
Total number of prefixes 1
RR#sh ip bgp vpnv4 all
RR#sh ip bgp vpnv4 all neighbors 10.250.0.101 routes
Total number of prefixes 0
RR#sh ip bgp vpnv4 all neighbors 10.250.0.102 routes
Total number of prefixes 0
Any feedback is appreciated. Thanks.
Regards,
Sergey

Install RAC failed with root.sh error while loading shared libraries: libst

Hi ,
I install rac under vmware workstation using this atricle .
http://www.oracle-base.com/articles/10g/OracleDB10gR2RACInstallationOnCentos4UsingVMware.php
everything work smoothly but I faced error with root.sh
Failed to upgrade Oracle Cluster Registry configuration
I found metlalink talk about missing compat-libstdc++-33-3.2.3-47.3.ia64.rpm and must be installed according to
that .
The probelm rasied when run
/u01/app/oracle/product/10.2.0/crs/bin/crsctl.bin: error while loading shared libraries: libstdc++.so.5: cannot
open shared object file: No such file or directory
Failure initializing entries in /etc/oracle/scls_scr/rac2.
Linux version is RHE4
[oracle@rac1 bin]$ uname -a
Linux rac1.localdomain 2.6.9-55.ELsmp #1 SMP Fri Apr 20 17:03:35 EDT 2007 i686 i686 i386 GNU/Linux
when install this package it does not work
[root@rac1 RPMS]# rpm -Uvh compat-libstdc++-33-3.2.3-47.3.ia64.rpm
warning: compat-libstdc++-33-3.2.3-47.3.ia64.rpm: V3 DSA signature: NOKEY, key ID b38a8516error: Failed
dependencies:
libc.so.6.1()(64bit) is needed by compat-libstdc++-33-3.2.3-47.3.ia64 libc.so.6.1(GLIBC_2.2)(64bit)
is needed by compat-libstdc++-33-3.2.3-47.3.ia64 libc.so.6.1(GLIBC_2.3)(64bit) is needed by compat-
libstdc++-33-3.2.3-47.3.ia64 libgcc_s.so.1()(64bit) is needed by compat-libstdc++-33-3.2.3-47.3.ia64
libgcc_s.so.1(GCC_3.0)(64bit) is needed by compat-libstdc++-33-3.2.3-47.3.ia64 libgcc_s.so.1(GCC_3.3)(64bit)
is needed by compat-libstdc++-33-3.2.3-47.3.ia64 libgcc_s.so.1(GLIBC_2.0)(64bit) is needed by compat-
libstdc++-33-3.2.3-47.3.ia64 libm.so.6.1()(64bit) is needed by compat-libstdc++-33-3.2.3-47.3.ia64
compat-libstdc++ = 7.3-2.96.128 is needed by (installed) compat-libstdc++-devel-7.3-2.96.128.i386 compat-
libstdc++ = 7.3 is needed by (installed) compat-gcc-c++-7.3-2.96.128.i386[root@rac1 RPMS]#
My probelm cannot install this packages ? What shoudl I do .

user12010537 wrote:
Hi ,
I found metlalink talk about missing compat-libstdc++-33-3.2.3-47.3.ia64.rpm and must be installed according to
Linux version is RHE4
[root@rac1 RPMS]# rpm -Uvh compat-libstdc++-33-3.2.3-47.3.ia64.rpm
warning: compat-libstdc++-33-3.2.3-47.3.ia64.rpm: V3 DSA signature: NOKEY, key ID b38a8516error: Failed
dependencies:
libc.so.6.1()(64bit) is needed by compat-libstdc++-33-3.2.3-47.3.ia64
My probelm cannot install this packages ? What shoudl I do .
Hi,
You need to install the dependency package first like glibc, etc
also see the output from runcluvfy, it should show which packages need to installed
Cheers

BGP requirements and load sharing

Hi !
I have been reading memory requirements for running BGP. But, for a tipical scenario with dual ISP for load sharing which are the requirements for the router ?
Could we use a 1841 or thinking about 37x5 or higher router ? I know that it depends on size for routing table, AS, and so on but what is the rule of thumb for choosing the correct router ?
Thanks
Rafa
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml#conf2
Load Sharing When Dual-Homed to One Internet Service Provider (ISP) Through a Single Local Router
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094a83.shtml
Achieve Optimal Routing and Reduce BGP Memory Consumption

Routes is one constraint and traffic is one more and the kind of policies i apply would be another. If i took a default from my upstream with about 1 MB of traffic, i would definitely look at 1841. If received routes ( atleast 20,000) and about 1 MB or 2 MB and 2 or more upstreams, I may even settle for a 3850.

Error while loading shared libraries libnnz10.so with brconnect

Hi
I am experiencing some problems within an installation, brconnect seems to be looking for oracle 10 libraries? while my oracle is a 9.2 !
these are the logs:
ERROR CJS-00288 Could not update database statistics.<br>DIAGNOSIS: Command brconnect -u / -c -f crsyn -o SAPXID returned 127.<br>SOLUTION: See brconnect.log for details.
brconnect.log:
Execution of the command "/sapmnt/XIE/exe/brconnect -u / -c -f crsyn -o SAPXID" finished with return code 127. Output:
/sapmnt/XIE/exe/brconnect: error while loading shared libraries: libnnz10.so: cannot open shared object file: No such file or directory
Yes, that's true, libnnz10.so does not exist, it happened something similar with the library libclntsh.so.10.1, I only have a libclntsh.so, with a softlink from libclntsh.so.9.
maybe the brtools imagine I have an oracle 10?
I specified a 9.2 Oracle during the installation!
Many thanks, Mario.

>
Tecnica de Sistemas wrote:
> I am experiencing some problems within an installation, brconnect seems to be looking for oracle 10 libraries? while my oracle is a 9.2 !
> [...]
> I specified a 9.2 Oracle during the installation!
Installation of what?
Clearly the BRTOOLS are version 700, so, even when you specified that Oracle 9i was to be installed the BRTOOLS delivered are the mentioned version and you
must install the oracle 10g instant client or
replace the version 700 by version 640
Regards

Have new iMac with iPhoto sharing turned on. When the shared library is clicked the library disappears or starts to load then disappears? What is wrong?

Have new iMac with iPhoto sharing turned on. When the shared library is clicked the library disappears or starts to load then disappears? What is wrong?

Try this: launch iPhoto with the Option key held down and create a new, test library. Import some photos and check to see if the same problem persists. If it doesn't then your current library is damaged and needs repair.
Therefore make a temporary, backup copy (select the library and type Command+D) and apply the two fixes below in order as needed:
Fix #1
Launch iPhoto with the Command+Option keys held down and rebuild the library.
Since only one option can be run at a time start with Option #1, followed by #3 and then #4 as needed.
Fix #2
Using iPhoto Library Manager to Rebuild Your iPhoto Library
Download iPhoto Library Manager and launch.
Click on the Add Library button, navigate to your Home/Pictures folder and select your iPhoto Library folder.
Now that the library is listed in the left hand pane of iPLM, click on your library and go to the File ➙ Rebuild Library menu option
In the next window name the new library and select the location you want it to be placed.
Click on the Create button.
Note: This creates a new library based on the LIbraryData.xml file in the library and will recover Events, Albums, keywords, titles and comments but not books, calendars or slideshows. The original library will be left untouched for further attempts at fixing the problem or in case the rebuilt library is not satisfactory.
If you experience the same problem with the test library then try this basic fix a try: make a temporary, backup copy (if you don't already have a backup copy) of the library and try the following:
1 - delete the iPhoto preference file, com.apple.iPhoto.plist, that resides in your
User/Home()/Library/ Preferences folder.
2 - delete iPhoto's cache file, Cache.db, that is located in your
User/Home()/Library/Caches/com.apple.iPhoto folder.
Click to view full size
3 - launch iPhoto and try again.
NOTE: If you're moved your library from its default location in your Home/Pictures folder you will have to point iPhoto to its new location when you next open iPhoto by holding down the Option key when launching iPhoto. You'll also have to reset the iPhoto's various preferences.
NOTE 2: In Lion and Mountain Lion the Library folder is now invisible. To make it permanently visible enter the following in the Terminal application window: chflags nohidden ~/Library and hit the Enter button - 10.7: Un-hide the User Library folder.
If that fails a reinstall of iPhoto is indicated. To do so you'll have to delete the current application and all files with "iPhoto" in the file name with either a .PKG or .BOM extension that reside in the HD/Library/Receipts folder and from the /var/db/receipts/ folder,
Click to view full size
Then install iPhoto from the source it came on originally.
OT

How to configure R/3 System with Load Balancing?

Hello,
I've created a Web DynPro Application and I would like to case an iView on it. According to SAP tutorials I first need to configure an R/3 System with Load Balancing.
My problem is how to configure the "WAS Host Name".
According to the tutorial:
WAS Host Name = <host>.<domain>:port (this corresponds to the Web Dynpro server location and the port on which it is running eg. PXYZ.wdf.sap.corp:50000.)
I am using NW 04 and my portal is running on this address:
http://ep6sp9test:50000/irj/portal
When I set the WAS Host Name to ep6sp9test:50000 the Test connection fails (I have privildges and created an alias and User mapping). What should I put at this field then?

Hi
I think you have to specify the HTTP port og the WAS running the R/3 system. The 50000 port is the HTTP port of your portal - not the R/3 system. You can see the HTTP port of the R/3 system using transactioncode SMICM - services in the R/3 system.
BR
Tom

Recommended configuration for load balanced Portal with load balancer, multiple gateways and multiple servers.

Does anyone have a recommended network, hardware and software configuration guide for a Portal installation running with multiple gateways load balanced (ie one URL) that talk to multiple servers?

David,
We've used Resonate (software) to load balance the gateways. It allows
you to group all the gateways under 1 virtual URL and load balance the
incoming connections over each gateway depending on the rules that you
define in Resonate. Look in the SUN portal whitepapers there is one that
talks about it specifically.
As far as load balancing the calls to the portals, the gateways will
automatically load balance across all the portals that they know about
using a simple round-robin rotation. You may be able to use Resonate in
front of the portals but you may need to activate persistance within
Resonate to ensure that the user always ends up on the portal that he
established his initial connection on (if you want that), check with Sun
on this one.
David Broeren wrote:
Recommended configuration for load balanced Portal with load balancer,
multiple gateways and multiple servers.
Does anyone have a recommended network, hardware and software
configuration guide for a Portal installation running with multiple
gateways load balanced (ie one URL) that talk to multiple servers?
Try our New Web Based Forum at http://softwareforum.sun.com
Includes Access to our Product Knowledge Base!

BGP Inbound & outboud Load Sharing

Hi Team,.
I am looking for input on the below
1) We are having 2 ISP & same is terminated on Same router, We want to use the ISP link with active & passive & my traffic (incoming & outgoing) should use active link
So As per my knowledge, For outgoing we can use Weight/ Incoming we need to use ASPath prepend on passive ISP
Pls confirm
2)We are having 2 ISP & same is terminated on different router, We want to use the ISP link with active & passive & my traffic (incoming & outgoing) should use active link
So As per my knowledge, For outgoing we can use Local Pref/ Incoming we need to use ASPath prepend on passive ISP
Pls confirm
And, for the above 2 senario, in case I need to use ISP in Active/active condition, how to configure the same with BGP
Br/Subhojit

Hi,
Here is a link with one router running BGP with 2 providers.
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a008009456d.shtml
This link shows multiple routers with multiple providers with examples abd configs:
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml
HTH

Simple Load Sharing With Static Routes

The scenario given below, L3 switch connected to 2 local LAN routers which in turn connected to internet router.
I would like to distribute the internet traffic from local LAN(L3 switch) on both RTRA and RTRB by adding static routes on L3 switch. How can I achieve this without configuring the routing protocol.
---------------RTRA----
L3SWITCH-------RTRB----INTERNET-RTR

Hi
If its simple internet traffic do keep in mind about the local NAT commands which has to be configured accordingly with route-maps here.
If you are having your own block of ip address space then better to run bgp between the providers.
regds

Linux JVM: How to load shared libraries with mutual/circular dependencies

Hi,
I am using the API
System.loadLibrary(String name)
to dynamically link shared libaries to Linux JVM.
The shared libraries has complex circular symbol dependencies among them.
I am not able to load shared libraries due to java.lang.UnsatisfiedLinkError.
Any ideas on how a number of shared libraries with interdependent realtionships
could be successfully linked in to the Linux JVM?
Thanks,
Soumen.
Background
===========
Successful execution of native code within Java virtual machine in a
host platform, has two necessary prerequisites:
Prerequisite 1: The native code is written to the JNI specification
Prerequisite 2: The native code is dynamically linked with Java virtual
machine.
The second step is achieved via simple Java interface, System.loadLibrary:
http://java.sun.com/j2se/1.4.2/docs/api/java/lang/System.html#loadLibrary(java.lang.String)
However, implementation of this interface is highly platform dependent
in regards to exact nature of dynamic linking process.
Tests
=====
I made three shared libraries libfeatureA.so, libfeatureB.so and libfeatureC.so.
Feature A and Feature B are mutually dependent on each other (i.e cicular
dependencies between libfeatureA.so, libfeatureB.so) whereas libfeatureC.so
has no external dependencies.
Case 1
I could link libfeatureC.so with java.
Case 2
Java failed to resolve circular dependency between libfeatureA.so, libfeatureB.so
resulting in linking failure. There may be repackaging workarounds which I have
not yet explored.
Java source code
================
class TestLoadLibrary
static
System.loadLibrary("featureB");
System.loadLibrary("featureA");
System.loadLibrary("featureB");
public static void main(String[] args)
System.out.println("In TestLoadLibrary.main()");
Exception in thread "main" java.lang.UnsatisfiedLinkError: /homes/soumen/work/event/featureB/libfeatureB.so.1.0: /homes/soumen/work/ev B.so.1.0: undefined symbol: featureA_func2
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1737)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1662)
at java.lang.Runtime.loadLibrary0(Runtime.java:817)
at java.lang.System.loadLibrary(System.java:986)
at TestLoadLibrary.<clinit>(TestLoadLibrary.java:5)

The use of "dlopen() application programming" to achieve dynamic link closure works if there are
no circular dependencies. For example, I have the following dependency:
libfeatureD.so ==> libfeatureC.so
Even if I call Java APIs in correct dependency order, i.e.,
System.loadLibrary("featureC");
System.loadLibrary("featureD");
there would be java.lang.UnsatisfiedLinkError for call System.loadLibrary("featureD").
Now, I have a JNI method implementation, which makes native API call in same dependency order:
dlopen("libfeatureC.so", RTLD_LAZY|RTLD_GLOBAL);
dlopen("libfeatureD.so", RTLD_LAZY|RTLD_GLOBAL);
and now System.loadLibrary calls succeed. Note that I had to set environment
variable LD_LIBRARY_PATH so that dlopen call would find libraries to load.
In other words, from a JNI programming point of view, "linking chasm" has been crossed.
I am looking at circular dependency issue, i.e.,
libfeatureA.so <==> libfeatureB.so
There may be library repackaging workaround.
If anybody knows any workaround, please post.
-Soumen Sarkar
JNI code
========
#include <jni.h>
#include "TestLoadLibrary.h"
#include <stdio.h>
#include <string.h>
#include <dlfcn.h>
JNIEXPORT void JNICALL Java_TestLoadLibrary_libLoadNative
(JNIEnv * jenv, jclass class, jobjectArray libNames)
printf("native: In TestLoadLibrary.libLoadNative()\n");
char linuxLibName[1024];
jsize idx = 0;
jsize nLibs = (*jenv)->GetArrayLength(jenv, libNames);
for(idx = 0; idx < nLibs; ++idx)
/* obtain the current object from the object array */
jobject myObject = (*jenv)->GetObjectArrayElement(jenv, libNames, idx);
/* Convert the object just obtained into a String */
const char libName = (jenv)->GetStringUTFChars(jenv,myObject,0);
strcpy(linuxLibName, "lib");
strcat(linuxLibName, libName);
strcat(linuxLibName, ".so");
printf("\nnative: Trying to open lib with name %s\n", linuxLibName);
void* handle = dlopen(linuxLibName, RTLD_LAZY|RTLD_GLOBAL);
if(handle == 0)
fputs ("\nnative: Could not load lib\n", stderr);
fputs (dlerror(), stderr);
else
printf("\nnative: Loaded lib %s\n", linuxLibName);
/* Free up memory to prevent memory leaks */
(*jenv)->ReleaseStringUTFChars(jenv, myObject, libName);
return;

Error 0(Native: listNetInterfaces:[3]) and error while loading shared libraries: libpthread.so.0: cannot open shared object file: No such file or directory

Hi Gurus,
I'm trying to upgrade my test 9.2.0.8 rac to 10.1 rac. I cannot upgrade to 10.2 because of RAM limitations on my test RAC. 10.1 Clusterware software was successfully installed and the daemons are up with OCR and voting disk created. Then during the installation of RAC software at the end, root.sh needs to be run. When I run root.sh, it gave the error: while loading shared libraries: libpthread.so.0: cannot open shared object file: No such file or directory. I have libpthread.so.0 in /lib. I looked up on metalink and found Doc ID: 414163.1 . I unset the LD_ASSUME_KERNEL in vipca (unsetting of LD_ASSUME_KERNEL was not required in srvctl because there was no LD_ASSUME_KERNEL in srvctl). Then I tried to run vipca manually. I receive the following error: Error 0(Native: listNetInterfaces:[3]). I'm able to see xclock and xeyes. So its not a problem with x.
OS: OEL5 32 bit
oifcfg iflist
eth0 192.168.2.0
eth1 10.0.0.0
oifcfg getif
eth1 10.0.0.0 global cluster_interconnect
eth1 10.1.1.0 global cluster_interconnect
eth0 192.168.2.0 global public
cat /etc/hosts
192.168.2.3 sunny1pub.ezhome.com sunny1pub
192.168.2.4 sunny2pub.ezhome.com sunny2pub
192.168.2.33 sunny1vip.ezhome.com sunny1vip
192.168.2.44 sunny2vip.ezhome.com sunny2vip
10.1.1.1 sunny1prv.ezhome.com sunny1prv
10.1.1.2 sunny2prv.ezhome.com sunny2prv
My questions are:
should ping on sunny1vip and sunny2vip be already working? As of now they dont work.
if you look at oifcfg getif, I initially had eth1 10.0.0.0 global cluster_interconnect,eth0 192.168.2.0 global public then I created eth1 10.1.1.0 global cluster_interconnect with setif. Should it be 10.1.1.0 or 10.0.0.0. I looked at the subnet calculator and it says for 10.1.1.1, 10.0.0.0 is the subnet. In metalink they had used 10.10.10.0 and hence I used 10.1.1.0
Any ideas on resolving this issue would be very much appreciated. I had been searching on oracle forums, google, metalink but all of them refer to DOC Id 414163.1 but it does n't seem to work. Please help. Thanks in advance.
Edited by: ayyappa on Aug 20, 2009 10:13 AM
Edited by: ayyappa on Aug 20, 2009 10:14 AM
Edited by: ayyappa on Aug 20, 2009 10:15 AM

a step forward towards resolution but i need some help from the gurus.
root# cat /etc/hosts
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
192.168.2.3 sunny1pub.ezhome.com sunny1pub
192.168.2.4 sunny2pub.ezhome.com sunny2pub
10.1.1.1 sunny1prv.ezhome.com sunny1prv
10.1.1.2 sunny2prv.ezhome.com sunny2prv
192.168.2.33 sunny1vip.ezhome.com sunny1vip
192.168.2.44 sunny2vip.ezhome.com sunny2vip
root# /u01/app/oracle/product/crs/bin/oifcfg iflist
eth1 10.0.0.0
eth0 192.168.2.0
root# /u01/app/oracle/product/crs/bin/oifcfg getif
eth1 10.0.0.0 global cluster_interconnect
eth0 191.168.2.0 global public
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl config nodeapps -n sunny1pub -a
****ORACLE_HOME environment variable not set!
ORACLE_HOME should be set to the main directory that contain oracle products. set and export ORACLE_HOME, then re-run.
root# export ORACLE_BASE=/u01/app/oracle
root# export ORACLE_HOME=/u01/app/oracle/product/10.1.0/Db_1
root# export ORA_CRS_HOME=/u01/app/oracle/product/crs
root# export PATH=$PATH:$ORACLE_HOME/bin
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl config nodeapps -n sunny1pub -a
VIP does not exist.
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl add nodeapps -n sunny1pub -o $ORACLE_HOME -A 192.168.2.33/255.255.255.0
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl add nodeapps -n sunny2pub -o $ORACLE_HOME -A 192.168.2.44/255.255.255.0
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl config nodeapps -n sunny1pub -a
VIP exists.: sunny1vip.ezhome.com/192.168.2.33/255.255.255.0
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl config nodeapps -n sunny2pub -a
VIP exists.: sunny2vip.ezhome.com/192.168.2.44/255.255.255.0
Once I execute the add nodeapps command as root on node 1, I was able to get vip exists for config nodeapps on node 2. The above 2 statements resulted me with same values on both nodes. After this I executed root.sh on both nodes, I did not receive any errors. It said CRS resources are already configured.
My questions to the gurus are as follows:
Should ping on vip work? It does not work now.
srvctl status nodeapps -n sunny1pub(same result for sunny2pub)
VIP is not running on node: sunny1pub
GSD is not running on node: sunny1pub
PRKO-2016 : Error in checking condition of listener on node: sunny1pub
ONS daemon is not running on node: sunny1pub
[root@sunny1pub ~]# /u01/app/oracle/product/crs/bin/crs_stat -t
Name Type Target State Host
ora....pub.gsd application OFFLINE OFFLINE
ora....pub.ons application OFFLINE OFFLINE
ora....pub.vip application OFFLINE OFFLINE
ora....pub.gsd application OFFLINE OFFLINE
ora....pub.ons application OFFLINE OFFLINE
ora....pub.vip application OFFLINE OFFLINE
Will crs_stat and srvctl status nodeapps -n sunny1pub work after I upgrade my database or should they be working now already? I just choose to install 10.1.0.3 software and after running root.sh on both nodes, I clicked ok and then the End of installation screen appeared. Under installed products, I see 9i home, 10g home, crs home. Under 10g home and crs home, I see cluster nodes(sunny1pub and sunny2pub) So it looks like the 10g software is installed.

Configure bgp with load sharing

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