Route distinguisher question

Hi,
I need to clear some concept regarding rd, i had a topology from one of the COD in which instructor connects 2 CE sites to each other using VPN_A but at one PE the configured RD was different and at another PE RD was different. The thing which connected both the CE sites was the same import/export RT.
Previously i knew that RD should be unique per customer then y did the instructor configured different RD for the same VPN. i.e VPN_A.
Next question is that is the Vrf name i.e VPN_A in this case locally significant on the router?

Hi,
RD is used for the sake of address space overlapping (by constructing unique VPNv4 routes; in the RD:IPv4 format) and also as a VRF identifier (on the PE and the RR the VRF is identified by the RD, accordingly the RD is a mandatory attribute for the VRF configuration), and it is only significant on the PEs and RRs if exists.
Accordingly, the RD for a certain VRF needs not be the same allover the MPLS domain, RT will be used to import and export prefixes between VRFs on different PEs, lets discuss how it really happens in order for you to be able to connect the pieces together; MP-BGP exchanges the VPNv4 (RD:IPv4) prefixes between the PEs (P routers are not VPNv4 aware) not IPv4 routes - When a PE receives a VPNv4 route it discards the RD attached to it and attaches its local RD (according to the VRF that the route is going to be injected into according to the attached RT and the local VRFs import RT) - Since for the local router routing table database the VRF is identified via the RD prepended to the IPv4 route to construct the VPNv4 routes.
With the same logic the VRF name is locally significant to the PE (it maps to a RD on the local PE, while having no significance on a RR, the RR only understands RDs), it is introduced to make things user friendly, rather than using the RD solely to identifying the VRF when doing configurations and with show commands - Most commonly the same VRF name is used on all PEs (with each PE having its own RD for this VRF in the format IP:number, where IP is the PE loopback and the number is a locally unique number).
I hope that i've been informative.
BR,
Mohammed Mahmoud.

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D       6.6.6.6 [90/435200] via 10.2.1.1, 00:05:26, Ethernet0/0
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C       7.7.7.7 is directly connected, Loopback1
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D EX    8.8.8.8 [170/2560025856] via 10.2.1.1, 00:02:13, Ethernet0/0
D EX 111.0.0.0/8 [170/2560025856] via 10.2.1.1, 00:02:13, Ethernet0/0
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C       10.2.1.0/24 is directly connected, Ethernet0/0
D       10.1.1.0/24 [90/307200] via 10.2.1.1, 00:05:56, Ethernet0/0
D       10.20.0.0/16 [90/435200] via 10.2.1.1, 00:05:56, Ethernet0/0
C       10.77.0.0/16 is directly connected, Loopback2
D EX 192.168.1.0/24 [170/2560025856] via 10.2.1.1, 00:02:43, Ethernet0/0
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*Mar 1 02:10:20.747: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 22: Neighbor 10.2.1.1 (Ethernet0/0) is
down: interface down
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O E2    6.6.6.6 [110/409600] via 10.2.1.1, 00:00:27, Ethernet0/0
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O E2    10.20.0.0/16 [110/409600] via 10.2.1.1, 00:00:26, Ethernet0/0
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Type escape sequence to abort.
Tracing the route to 6.6.6.6
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5 10.1.1.2 1940 msec * 2200 msec
R7#

Hello Edward,
I see nothing strange in the results you have posted. They are completely natural to the process of carrying customer routes over MPLS L3 VPN.
You know yourself that the customer routes are carried between PE routers using BGP, and from PE towards CE, these routes are redistributed from BGP into the particular routing protocol running between PE and CE. Each of these routing protocols automatically marks redistributed networks as external networks. For OSPF, this is a normal part of the open protocol specification - that routes injected into OSPF via redistribution shall be represented as external routes (and carried in LSA-5). Similarly, when you redistribute into EIGRP from a different routing protocol, these routes will be carried by EIGRP as external networks. So what you see here is natural and normal. Even if all sites ran the same routing protocol (EIGRP or OSPF), one site would see networks from other sites as external routes.
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Best regards,
Peter

Wireless Router WAN Question

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Route Distinguisher operation

Hi,
I need help with the operation of RD.
I Know that the RD (64 bits) is attached to the prefix when is send into the MP-BGP cloud to other PE?s, being converted in a VPNv4 packet.
My question is: What is the route decision process in the receiving PE?.
For example:
PE1 is configured to import routes with IMPORT RT 1:100 and RD 2:100.
To PE1 arrives 2 updates both with EXPORT RT 1:100 and for network 10.0.0.0 /24.
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Thanks for all.

I received some unicasts upon my last reply to this post. The confusion created
was, how will two paths be passed to the CE.
Well its quite evident that if the CE has only one physical path to the PE then it
cannot receive two paths. Only if the CE has two paths (dual homed) then only the CE
loadbalance or else the PE will do tha loadbalancing for the same end destination.
But to do that we have to use different RD values for the same routes from two different
PE's. So that we get the route till our PE in its MPBGP table and then we have to get
it into the forwarding table that is the VRF table by using maximum-paths ibgp 2.
Just wanted to clear the confusion. :-)
And to answer more crisply rather than generically to the original post,
so as to avoid confusion.
Q//
1- Both networks are inserted in the MP-BGP table?
A - Yes both the routes will be there in the MPBGP table as it wont be
filtered by your RR.
Can be verified by using "show ip bgp vpnv4 all"
Q//
2- What network is imported into the VRF, both, only one?
Both the routes would be installed in the CE VRF table by using maximum-paths ibgp 2.
Can be verified by using "show ip route vrf x"
HTH-Cheers,
Swaroop

Wireless Router/Networking question

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Hi, I have recently moved home and changed my details in my Apple ID but when using find friends or the maps app I am still located at my previous address, can you help ?

If you have the WiFi-only iPad (which does not have GPS) your location is determined by the mapped location of nearby WiFi routers.
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Hi,
I have recently connected a Linksys router (WRT54GC) via ethernet cables between my cable modem and my iMac C2D.
Also, I connected an iMac G3 (upstairs) to that router via ethernet wall-plug adapters.
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My question is: am I still vulnerable to someone connecting to my computers wirelessly through the Linksys? Should I configure the router for security protection?
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Phillip
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If you've set up the router with a decent password and turned-off SSID broadcasts, then it's unlikely someone will be able to access your network via the wireless access.
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Hello Jimmy,
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First Time Router User Questions

This is my very first time owning and using a router, so I have a few questions I'd like to ask.
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Message Edited by LadyYuina on 03-26-2009 02:37 AM
Message Edited by LadyYuina on 03-26-2009 02:37 AM
Solved!
Go to Solution.

For a first time router owner your questions are perfectly normal. You dont have to turn off anything and the post about security is good advice. If your primary concern is bandwidth then you don' t want all your neighbors eating it up. As far as your LAN or Local Area Network you can leave that on as well with no bandwith issues. (Though with wireless you make run into some connectivity issues) Try not to confuse LAN with WAN. LAN = your network, WAN is you ISP a.k.a your bandwidth. Finally your WEP key (which is what I'm assuming you have to enter every time you disconnect) you can just leave that in and don't click on "disconnect" or you will be entering it everytime

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If you have the subnet 24.48.75.0/24 giving you a host range of 24.48.75.1 - 254 defined on an interface
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yes is helps immensely. thank you.
i was sort of leading somewhere as i have this very odd customer problem.
the router above (call it routerA) with the info i bolded, has a primary gig 0/3 address of :
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ip route 70.11.123.104 255.255.255.248 70.11.120.182
From RouterB:
sh ip route 70.11.120.64 255.255.255.192
% Network not in table
So naturally uses the default route and sends it to 70.11.120.5.
My problem is 70.11.120.5 is a glbp ip address on RouterA.
So i guess my question becomes do i have a routing loop or am I not grasping a config issue with glbp?

Router E2000 question

Hi, I'm new to wireless internet and have a ?. I purchased a Wii setup and want to connect it to the router. I have tried many times to hook it up and keep getting a no go.My son set the router up with his laptop and now he has gone back to collage. My computer hasn't got the software loaded on it for the router. If i put the cd in my computer it asks for password and such, son says he didn't put one in, but still can't get by that screen. We have three other computers hooked to the router now. If i go and reset the router what happens? Do i have to reset all computers to work off the router both Main and guest. Any help will be appreciated.

You can find the E2000 manual here:
http://home.cisco.com/assets/presskit/userguides/e2000_ug.pdf
This question is better asked on the Linksys forums at http://homecommunity.cisco.com/
How did he set up the 3 PCs? If he used the Easy Setup Key method, he would have never set a password. However, the Wii does not support the Easy Setup Key method.
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You can configure the router without the CD by using a web browser on one of the attached PCs. You would type "192.168.1.1" into the browser "address bar" on any attached PC and log in with username admin and password admin, if those passwords were not changed.

Basic router security question

I have the wrt54g wireless router. I have never set up security on the router but am going to now. I have my desktop plugged directly into the router and my laptop connects wirelessly. If I go to one of the encryption modes is it just my laptop that will need to know the encryption key to connect? Because the desktop is plugged directly in will anything need to be done for it to connect after encrytion is turned on?
Second question , if the ssid is turned off how does my laptop find the router in order to connect to it? Thanks.
Carl

Carl,
On your two questions:
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2) Your laptop will ask for a connection to the unbroadcast SSID and the router will respond with effectively, "Here I am." It's no different than you calling out someone's name when you're looking for them. They'll respond ... usually. Not broadcasting an SSID simply prevents people from finding the network by having their computer build a list.
Hope that helps.
Scott

SRST router basis questions

Hi friends,
For a branch office connectivity solution, we are planning for a 2811 router with SRST being able to make voice calls to the PSTN via a BRI card. Just three questions on this :
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Gautam,
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Take few minutes to run through and digest this 'Quick Look' guide to ISR bundles.
http://www.cisco.com/application/pdf/en/us/guest/products/ps5854/c1650/cdccont_0900aecd804e773d.pdf
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