Disable Bridge Assurance breaks the vPC on NEXUS 5500?

I`m trying to figure out a way to disable Bridge Assurance "spanning-tree port type normal" withowt breaking the vPC connection between two datacentres.
Considering the diagram attached, I`m hoping to configure vPC 10 without any disruption.
I was thinking on the following procedure:
"shutdown" switchports for vPC 10 (on the left link)
configure switches on the left of both domains with "spanning-tree port type normal"
"no shutdown" switchports for vPC 10 (at this point one link will have BA enabled and the other will have BA disabled...is this a problem??)
repeat process on the other 2 switches
I realy need to be sure of a non-disruptive way to do this because, if vPC 10 breaks both firewall will be active at the same time and that`s not going to be pretty :)

First Reload
CORE-B# 2009 Mar 5 12:53:37 CORE-B %$ VDC-1 %$ %VPC-2-VPC_SUSP_ALL_VPC: Peer-link going down, suspending all vPCs on secondary
2009 Mar 5 12:53:43 CORE-B %$ VDC-1 %$ %VPC-2-PEER_KEEP_ALIVE_RECV_FAIL: In domain 10, VPC peer keep-alive receive has failed
Second Reload
CORE-B# 2009 Mar 5 13:02:59 CORE-B %$ VDC-1 %$ %VPC-2-PEER_KEEP_ALIVE_RECV_FAIL: In domain 10, VPC peer keep-alive receive has failed
I’m consoled in to CORE-B, ssh’d to CORE-A and reloading CORE-A (The primary). No changes at all between the two reloads.
During the first one, it seems to lose the VPC peer link before it loses the keepalives, so it suspends all the VPC’s on B and I lose everything for a while.
During the second one, it loses the peer keepalive first and all is good.

Similar Messages

Nexus 5500 duplicate ICMP echo-replay

I am experiencing inconsistent echo-replay from devices connected via VPC to Nexus 5500s while pinging from the Nexus exec prompt.
In some cases I receive normal response when pinging from one Nexus, but no response when pinging from the other switch. In other instance I receive normal response to one Nexus, and duplicate replays to the other. It looks like a VPC related bug. NXOS is 5.1.3.N2.1
5501# ping 10.12.12.232
PING 10.12.12.232 (10.12.12.232): 56 data bytes
64 bytes from 10.12.12.232: icmp_seq=0 ttl=253 time=8.585 ms
64 bytes from 10.12.12.232: icmp_seq=0 ttl=254 time=9.227 ms (DUP!)
64 bytes from 10.12.12.232: icmp_seq=1 ttl=253 time=1.011 ms
64 bytes from 10.12.12.232: icmp_seq=2 ttl=253 time=8.097 ms
64 bytes from 10.12.12.232: icmp_seq=2 ttl=254 time=9.429 ms (DUP!)
64 bytes from 10.12.12.232: icmp_seq=3 ttl=253 time=18.195 ms
64 bytes from 10.12.12.232: icmp_seq=4 ttl=253 time=8.807 ms
5502# ping 10.12.12.232
PING 10.12.12.232 (10.12.12.232): 56 data bytes
64 bytes from 10.12.12.232: icmp_seq=0 ttl=254 time=0.985 ms
64 bytes from 10.12.12.232: icmp_seq=1 ttl=254 time=0.884 ms
64 bytes from 10.12.12.232: icmp_seq=2 ttl=254 time=0.875 ms
64 bytes from 10.12.12.232: icmp_seq=3 ttl=254 time=3.105 ms
64 bytes from 10.12.12.232: icmp_seq=4 ttl=254 time=8.378 ms
Thanks
Jarek

Hi
I found this in the configuration guide for the Nexus 7000 configuring VPCs
"When you enable this feature (peer-gateway), Cisco NX-OS automatically disables IP redirects on all interface VLANs mapped over a vPC VLAN to avoid generation of IP redirect messages for packets switched through the peer gateway router."
However this is not happening automatically on the 5K, so you need to manually add "no ip redirects" on each VPC vlan interface to prevent duplicate pings.

Nexus 5500 - Fabricpath Core Port - Error disabled. Reason:DCX-No ACK in 100 PDUs

Has anyone seen Fabricpath Core Interfaces between two Nexus 5596UP switches error-disabled because of missing DCBX Acks after 50mins?
I do not see interface errors and the peer is another 5500.
Both switches are running 5.1(3)N2(1) with this port config:
int e1/3
switchport mode fabricpath
! Cisco 5m Twinax cables
Log messages
2012 May 25 17:40:59 nexus1 %L3VM-5-FP_TPG_INTF_DOWN: Interface Ethernet1/3 down in fabricpath topology 0 - Interface down
2012 May 25 17:40:59 nexus1 %ETHPORT-5-IF_DOWN_NONE: Interface Ethernet1/3 is down (None)
2012 May 25 17:40:59 nexus1 %ISIS_FABRICPATH-5-ADJCHANGE: isis_fabricpath-default [3365] P2P adj L1 nexus5 over Ethernet1/3 - DOWN (Delete All) on MT-0
2012 May 25 17:40:59 nexus1 %CDP-5-NEIGHBOR_REMOVED: CDP Neighbor nexus5(FOX1550GDH1) on port Ethernet1/3 has been removed
2012 May 25 17:40:59 nexus1 %LLDP-5-SERVER_REMOVED: Server with Chassis ID 547f.ee63.fa88 Port ID Eth1/1 on local port Eth1/3 has been removed
2012 May 25 17:40:59 nexus1 %ETHPORT-2-IF_DOWN_ERROR_DISABLED: Interface Ethernet1/3 is down (Error disabled. Reason:DCX-No ACK in 100 PDUs)
Robert

Can you send the output of
show lldp interface ethernet 1/3
show lldp dcbx interface ethernet 1/3
a workaround may be to disable lldp on both sides on these physical interfaces

Can I disable spanning-tree in a vpc domain ?

i have two N7718s in a vpc domain and each have a vpc connection to 300+ TORs(non cisco switch).
each 7718 have 300+ trunk port and a trunk port carring 80 vlans . so the logical port number is 300*80 = 24000
the problem is n7k r-pvst logical ports limit is 16000,it causes the vpc primary 7718 ping latancy time exceed 1000ms
2 ways to solve this problem : use mst instead of rpvst or disable spanning-tree
if i use mst , the logical ports limit is 90000, the problem will appear one day
so i want to disable spanning-tree . 7718s' vpc link to TOR use lacp ,it will prevent some layer2 loops. can i do it?

I have the same problem. :)

Ask the Expert: Cisco Nexus 2000, 5000, and 6000 Series Switches

with Cisco Expert Vinayak Sudame
Welcome to the Cisco Support Community Ask the Expert conversation. This is an opportunity to learn and ask questions how to configure and troubleshoot the Cisco Nexus 2000, 5000 and 6000 Series Switches with Cisco subject matter expert Vinayak Sudame. You can ask any question on configuration, troubleshooting, features, design and Fiber Channel over Ethernet (FCoE).
Vinayak Sudame is a Technical Lead in Data Center Switching Support Team within Cisco's Technical Services in RTP, North Carolina. His current responsibilities include but are not limited to Troubleshooting Technical support problems and Escalations in the areas of Nexus 5000, Nexus 2000, FCoE. Vinayak is also involved in developing technical content for Cisco Internal as well as external. eg, Nexus 5000 Troubleshooting Guide (CCO), Nexus 5000 portal (partners), etc. This involves cross team collaboration and working with multiple different teams within Cisco. Vinayak has also contributed to training account teams and partners in CAE (Customer Assurance Engineering) bootcamp dealing with Nexus 5000 technologies. In the past, Vinayak's responsibilities included supporting MDS platform (Fiber Channel Technologies) and work with EMC support on Escalated MDS cases. Vinayak was the Subject Matter Expert for Santap Technologies before moving to Nexus 5000 support. Vinayak holds a Masters in Electrical Engineering with Specialization in Networking from Wichita State University, Kansas. He also holds Cisco Certification CCIE (#20672) in Routing and Switching.
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Hi Vinayak,
Output of "show cfs internal ethernet-peer database"
Switch 1
ETH Fabric
Switch WWN logical-if_index
20:00:54:7f:ee:b7:c2:80 [Local]
20:00:54:7f:ee:b6:3f:80 16000005
Total number of entries = 2
Switch 2
ETH Fabric
Switch WWN logical-if_index
20:00:54:7f:ee:b6:3f:80 [Local]
20:00:54:7f:ee:b7:c2:80 16000005
Total number of entries = 2
Output of "show system internal csm info trace"
Switch 1 in which "show cfs peers" show proper output
Mon Jul 1 05:46:19.145339 (CSM_T) csm_sp_buf_cmd_tbl_expand_range(8604): No range command in buf_cmd_tbl.
Mon Jul 1 05:46:19.145280 (CSM_T) csm_set_sync_status(6257): Peer RT status PSSed
Mon Jul 1 05:46:19.145188 (CSM_T) csm_sp_handle_local_verify_commit(4291):
Mon Jul 1 05:46:19.145131 csm_continue_verify_ac[597]: peer is not reachable over CFS so continuing with local verify/commit
Mon Jul 1 05:46:19.145071 csm_tl_lock(766): Peer information not found for IP address: '172.16.1.54'
Mon Jul 1 05:46:19.145011 csm_tl_lock(737):
Mon Jul 1 05:46:19.144955 (CSM_EV) csm_sp_build_tl_lock_req_n_send(941): sending lock-request for CONF_SYNC_TL_SESSION_TYPE_VERIFY subtype 0 to Peer ip = (172.16.1.54)
Mon Jul 1 05:46:19.143819 (CSM_T) csm_copy_image_and_internal_versions(788): sw_img_ver: 5.2(1)N1(2a), int_rev: 1
Mon Jul 1 05:46:19.143761 (CSM_T) csm_sp_get_peer_sync_rev(329): found the peer with address=172.16.1.54 and sync_rev=78
Mon Jul 1 05:46:19.143699 (CSM_T) csm_sp_get_peer_sync_rev(315):
Mon Jul 1 05:46:19.143641 (CSM_EV) csm_sp_build_tl_lock_req_n_send(838): Entered fn
Mon Jul 1 05:46:19.143582 (CSM_T) csm_set_sync_status(6257): Peer RT status PSSed
Switch 2 in which "show cfs peers" does not show proper output
Mon Jul 1 06:13:11.885354 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd switchport mode trunk, cmd pseq 77 seq 482
Mon Jul 1 06:13:11.884992 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd channel-group 51 mode active, cmd pseq 357 seq 369
Mon Jul 1 06:13:11.884932 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd switchport trunk allowed vlan 2, 11, cmd pseq 357 seq 368
Mon Jul 1 06:13:11.884872 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd switchport mode trunk, cmd pseq 357 seq 367
Mon Jul 1 06:13:11.884811 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd description process_vpc, cmd pseq 357 seq 366
Mon Jul 1 06:13:11.884750 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd channel-group 51 mode active, cmd pseq 352 seq 365
Mon Jul 1 06:13:11.884690 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd switchport trunk allowed vlan 2, 11, cmd pseq 352 seq 364
Mon Jul 1 06:13:11.884630 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd switchport mode trunk, cmd pseq 352 seq 363
Mon Jul 1 06:13:11.884568 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd description process_vpc, cmd pseq 352 seq 362
Mon Jul 1 06:13:11.884207 (CSM_EV) csm_sp_acfg_gen_handler(3011): Preparing config into /tmp/csm_sp_acfg_1733916569.txt
Mon Jul 1 06:13:11.878695 csm_get_locked_ssn_ctxt[539]: Lock not yet taken.
Mon Jul 1 06:13:11.878638 (CSM_EV) csm_sp_acfg_gen_handler(2937): Recieved sp acfg merge request for type: running cfg
Mon Jul 1 06:12:29.527840 (CSM_T) csm_pss_del_seq_tbl(1989): Freeing seq tbl data
Mon Jul 1 06:12:29.513255 (CSM_T) csm_sp_acfg_gen_handler(3106): Done acfg file write
Mon Jul 1 06:12:29.513179 (CSM_EV) csm_sp_acfg_gen_handler(3011): Preparing config into /tmp/csm_sp_acfg_1733911262.txt
Mon Jul 1 06:12:29.508859 csm_get_locked_ssn_ctxt[539]: Lock not yet taken.
Mon Jul 1 06:12:29.508803 (CSM_EV) csm_sp_acfg_gen_handler(2937): Recieved sp acfg merge request for type: running cfg
Mon Jul 1 05:53:17.651236 Collecting peer info
Mon Jul 1 05:53:17.651181 Failed to get the argumentvalue for 'ip-address'
Mon Jul 1 05:40:59.262736 DB Unlocked Successfully
Mon Jul 1 05:40:59.262654 Unlocking DB, Lock Owner Details:Client:1 ID:1
Mon Jul 1 05:40:59.262570 (CSM_T) csm_sp_del_buf_cmd(1713): Deleting comand with Id = 1
Mon Jul 1 05:40:59.262513 DB Lock Successful by Client:1 ID:1
Mon Jul 1 05:40:59.262435 Recieved lock request by Client:1 ID:1
Mon Jul 1 05:40:41.741224 ssnmgr_ssn_handle_create_get: Session FSM already present, ID:1
Mon Jul 1 05:40:41.741167 ssnmgr_handle_mgmt_request: Create/Get request received for session[process_n5kprof]
show cfs lock gives no output.
Just to further clarify, we have 4 5548UP switches in the same management vlan. 2 switches are in one location lets say location A and they are CFS peers and are working fine.
These two switches which are having problem are in location B. All the switches are in the same vlan. Essentially the all CFS multicast messages will be seen by all 5548 switches as they are in the same vlan. I am assuming that this might not create any problems as we specify the peers in the respective configurations. Or do we have to change the CFSoIPv4 multicast addresses in location B or may be configure a different region.
Regards.

VPC on Nexus 5000 with Catalyst 6500 (no VSS)

Hi, I'm pretty new on the Nexus and UCS world so I have some many questions I hope you can help on getting some answers.
The diagram below is the configuration we are looking to deploy, that way because we do not have VSS on the 6500 switches so we can not create only one Etherchannel to the 6500s.
Our blades inserted on the UCS chassis have INTEL dual port cards, so they do not support full failover.
Questions I have are.
- Is this my best deployment choice?
- vPC highly depend on the management interface on the Nexus 5000 for the keep alive peer monitoring, so what is going to happen if the vPC brakes due to:
     - one of the 6500 goes down
          - STP?
          - What is going to happend with the Etherchannels on the remaining 6500?
     - the Management interface goes down for any other reason
          - which one is going to be the primary NEXUS?
Below is the list of devices involved and the configuration for the Nexus 5000 and 65000.
Any help is appreciated.
Devices
·         2 Cisco Catalyst with two WS-SUP720-3B each (no VSS)
·         2 Cisco Nexus 5010
·         2 Cisco UCS 6120xp
·         2 UCS Chassis
     -    4 Cisco B200-M1 blades (2 each chassis)
          - Dual 10Gb Intel card (1 per blade)
vPC Configuration on Nexus 5000
TACSWN01
TACSWN02
feature vpc
vpc domain 5
reload restore
reload restore   delay 300
Peer-keepalive   destination 10.11.3.10
role priority 10
!--- Enables vPC, define vPC domain and peer   for keep alive
int ethernet 1/9-10
channel-group 50   mode active
!--- Put Interfaces on Po50
int port-channel 50
switchport mode   trunk
spanning-tree port   type network
vpc peer-link
!--- Po50 configured as Peer-Link for vPC
inter ethernet 1/17-18
description   UCS6120-A
switchport mode   trunk
channel-group 51   mode active
!--- Associates interfaces to Po51 connected   to UCS6120xp-A
int port-channel 51
swithport mode   trunk
vpc 51
spannig-tree port   type edge trunk
!--- Associates vPC 51 to Po51
inter ethernet 1/19-20
description   UCS6120-B
switchport mode   trunk
channel-group 52   mode active
!--- Associates interfaces to Po51 connected   to UCS6120xp-B
int port-channel 52
swithport mode   trunk
vpc 52
spannig-tree port   type edge trunk
!--- Associates vPC 52 to Po52
!----- CONFIGURATION for Connection to   Catalyst 6506
Int ethernet 1/1-3
description   Cat6506-01
switchport mode   trunk
channel-group 61   mode active
!--- Associate interfaces to Po61 connected   to Cat6506-01
Int port-channel 61
switchport mode   trunk
vpc 61
!--- Associates vPC 61 to Po61
Int ethernet 1/4-6
description   Cat6506-02
switchport mode   trunk
channel-group 62   mode active
!--- Associate interfaces to Po62 connected   to Cat6506-02
Int port-channel 62
switchport mode   trunk
vpc 62
!--- Associates vPC 62 to Po62
feature vpc
vpc domain 5
reload restore
reload restore   delay 300
Peer-keepalive   destination 10.11.3.9
role priority 20
!--- Enables vPC, define vPC domain and peer   for keep alive
int ethernet 1/9-10
channel-group 50   mode active
!--- Put Interfaces on Po50
int port-channel 50
switchport mode   trunk
spanning-tree port   type network
vpc peer-link
!--- Po50 configured as Peer-Link for vPC
inter ethernet 1/17-18
description   UCS6120-A
switchport mode   trunk
channel-group 51   mode active
!--- Associates interfaces to Po51 connected   to UCS6120xp-A
int port-channel 51
swithport mode   trunk
vpc 51
spannig-tree port   type edge trunk
!--- Associates vPC 51 to Po51
inter ethernet 1/19-20
description   UCS6120-B
switchport mode   trunk
channel-group 52   mode active
!--- Associates interfaces to Po51 connected   to UCS6120xp-B
int port-channel 52
swithport mode   trunk
vpc 52
spannig-tree port   type edge trunk
!--- Associates vPC 52 to Po52
!----- CONFIGURATION for Connection to   Catalyst 6506
Int ethernet 1/1-3
description   Cat6506-01
switchport mode   trunk
channel-group 61   mode active
!--- Associate interfaces to Po61 connected   to Cat6506-01
Int port-channel 61
switchport mode   trunk
vpc 61
!--- Associates vPC 61 to Po61
Int ethernet 1/4-6
description   Cat6506-02
switchport mode   trunk
channel-group 62   mode active
!--- Associate interfaces to Po62 connected   to Cat6506-02
Int port-channel 62
switchport mode   trunk
vpc 62
!--- Associates vPC 62 to Po62
vPC Verification
show vpc consistency-parameters
!--- show compatibility parameters
Show feature
!--- Use it to verify that vpc and lacp features are enabled.
show vpc brief
!--- Displays information about vPC Domain
Etherchannel configuration on TAC 6500s
TACSWC01
TACSWC02
interface range GigabitEthernet2/38 - 43
description   TACSWN01 (Po61 vPC61)
switchport
switchport trunk   encapsulation dot1q
switchport mode   trunk
no ip address
channel-group 61   mode active
interface range GigabitEthernet2/38 - 43
description   TACSWN02 (Po62 vPC62)
switchport
switchport trunk   encapsulation dot1q
switchport mode   trunk
no ip address
channel-group 62   mode active

ihernandez81,
Between the c1-r1 & c1-r2 there are no L2 links, ditto with d6-s1 & d6-s2. We did have a routed link just to allow orphan traffic.
All the c1r1 & c1-r2 HSRP communications ( we use GLBP as well ) go from c1-r1 to c1-r2 via the hosp-n5k-s1 & hosp-n5k-s2. Port channels 203 & 204 carry the exact same vlans.
The same is the case on the d6-s1 & d6-s2 sides except we converted them to a VSS cluster so we only have po203 with 4 *10 Gb links going to the 5Ks ( 2 from each VSS member to each 5K).
As you can tell what we were doing was extending VM vlans between 2 data centers prior to arrivals of 7010s and UCS chassis - which worked quite well.
If you got on any 5K you would see 2 port channels - 203 & 204 - going to each 6500, again when one pair went to VSS po204 went away.
I know, I know they are not the same things .... but if you view the 5Ks like a 3750 stack .... how would you hook up a 3750 stack from 2 6500s and if you did why would you run an L2 link between the 6500s ?
For us using 4 10G ports between 6509s took ports that were too expensive - we had 6704s - so use the 5Ks.
Our blocking link was on one of the links between site1 & site2. If we did not have wan connectivty there would have been no blocking or loops.
Caution .... if you go with 7Ks beware of the inability to do L2/L3 via VPCs.
better ?
one of the nice things about working with some of this stuff is as long as you maintain l2 connectivity if you are migrating things they tend to work, unless they really break

Would a wireless bridge work with the Home Hub 5?

Hi there. I am wondering if I might avail myself of the community's advice and wisdom. I'm due to have Infinity 2 installed in a week or two, but I have a few concerns about how to get things working properly. Mainly I am wondering how on earth to connect my PC to it, when they won't be on the same floor in the house. The worrying over this almost has me rethinking the wisdom of changing from my old ISP of twelve years.
The Home Hub 5 will be installed downstairs at the master socket (or whatever that thing is called), but the family PC (currently wired to a Netgear DGT2200 'N' modem/router) is upstairs. I can't run wires all over the house (so sayeth the wife) so I am a bit stuck thinking of a solution that is workable. My neighbour had his Master Socket moved (I think) to solve a similar issue, but I'd prefer not to (if the engineers would even offer that) as access to the socket for the study is really restricted by several very full and rather rickety bookshelves.
I was thinking of using a wireless 802.11ac bridge, like the Linksys WUMC710, so I can connect a PC, Xbox360, SkyHD box and Blu player to the network whilst not having to use 4 separate adapters. However that bridge is single band only, (frankly I can't find a dual band AC bridge). Would the 5ghz signal from the Home Hub 5 be strong enough upstairs, bearing in mind it has to go up one floor and through one (admittedly paper thin) wall (the study is nearly directly above where the hub would be positioned)? It would rather defeat the object of switching to FTTC if the only room with a decent connection is the one where I only use ipads, another SkyHD box and very occasionally a laptop. The PC is arguably the one device that I want/need a good connection for work/play.

I'd hoped I was done with wondering what to do on this, but more reading has confused me even further.
1. If I did ask the engineer (likely a contractor I gather) to have the master socket moved upstairs (and he agreed to do it), is it true that the current telephone extension sockets would not longer work unless rewired? Not a deal breaker as I only use one of them for the master unit for my cordless phones.
2. If the engineer either refused to move the Master Socket or I opted not to ask due to the extension socket issue, am I correct in thinking I can pay something like £130 for a BT Engineer to come out to specifically move the Master Socket and rewire the extension sockets? The difference in cost between that and buying good powerline extenders and a switch is not that much (especially if I'd lose less connection speed by doing that). Actually I think a friend of my father's is a BT engineer...I should probably be asking him this.

Disable Bridge in order to install software???

I can't install, or indeed uninstall any Adobe software. When I try, I get a message saying to turn off Adobe Bridge to proceed. As far as I am aware, Bridge isn't in fact running... Certainly not according to task manager.
I urgently need to install photoshop. Any ideas? Do I need to disable Bridge? If so, how do I do this?

I have the same problem. I have a corrupted CS4 Design Suite and when I try to reinstall it, I get the error message "Bridge needs to be disabled in order to continue with a re-install. I cannot open any of the programs in the suite. I have tried to get Adobe tech support but I end up talking to someone in India sitting in front of a monitor reading from a prepared script in a binder. There is no one knowledgeable at support who knows what files I need to delete in windows 7. If I try to delete any CS4 folder or file in the folders, I get the error message "The program is being used somewhere else now so it cannot be deleted. This is turning into a exercise in patience. I am really disapointed and as I read these threads, it seems to be a problem in CS5 as well. Any suggestions would be appreciated as I don't want reformat the drive. Thanks.

Bridge assurance vs Loop Guard

Hi all!
I can't understand practical advantages of Bridge Assurance compared with Loop Guard.
What exactly can do BA and can't do Loop Guard?
Than you!!

Hi,
I hope you might have already read the below link which gives detailed explanation of what these two stp features does:
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/stp_enha.html#wp1052528
http://www.netcraftsmen.net/blogs/entry/what-is-bridge-assurance.html
2)
There are a few scenarios where LoopGuard would not be effective at detecting loops and/or unidirectional links.
- can only be enabled on root & alternate ports. it CANNOT run on 'designated ports'.
- ineffective at detecting a port that has been unidirectional since link-up.
Bridge Assurance (BA) is effective at mitigating those remaining scenarios that LoopGuard could not.
BA works because it turns STP into operating more like a routing protocol where BPDUs now go both ways on a given link verifying device health/awareness / lack of braindeadness.
i.e. it turns STP from traditional "fail open" behavior to "fail closed".
compare figure 1 to figure 3 in
<http://www.cisco.com/en/US/docs/switches/datacenter/sw/4_2/nx-os/layer2/configuration/guide/Cisco_Nexus_7000_Series_NX-OS_Layer_2_Switching_Configuration_Guide_Release_4.2_chapter7.html#con_1285149>
and it should be clear.
HTH
Regards
Inayath
***** Please rate if this post if the info is usefull.

I have updated my IPhone 4s to ios6, but for some reason it didn't install Siri with the update, is there any way I can install it onto my IPhone without jail breaking the phone?

I have updated my IPhone 4s to ios6, but for some reason it didn't install Siri with the update, is there any way I can install it onto my IPhone without jail breaking the phone?

Macca_astles01 wrote:
It is an iPhone 4s, it has voice control but it's not Siri, is there any way I can install it?
It cannot be installed. It comes pre-installed on every iPhone 4S and later. Maybe it was disabled under Settings > General > Restrictions.
Courcoul wrote:
Wasn't SIRI one of the gee-wiz doodads introduced with iOS 6? Cause my boss' 4s w/iOS 5 certainly does NOT have it. And on my i5, the Spanish-speaking SIRI I got turned out female, with all the foibles and vicissitudes....
iOS 6 only added support for the 3rd generation iPad. It was always on the iPhone 4S. Then the same goes for your boss: Maybe disabled in restrictions, or maybe actually an iPhone 4.

Double check my interface config, what is the "vpc" line?

Dual nexus 5010 switches,
Say I'm bringing up a new LACP port for a server, this is what I'd do (on both switches)
interface port-channel135
description LouPrBdw025
vpc 135
switchport access vlan 14
interface Ethernet105/1/7
description LouPrBdw025
switchport access vlan 14
channel-group 135 mode active
I understand everything there, and this works, but on the port-channel interface, what is the "vpc 135" line for? is it needed?

Hi,
According to the IEEE 802.3ad Link Aggregation standard, an aggregate link (or port-channel in Cisco terminology) is only allowed between two devices e.g., a single switch and a server. This can be used if you want to add additional bandwidth or provide resilience against link failure, but it doesn't provide resilience against a switch failure.
The Cisco vPC (virtual port-channel) is a proprietary mechanism that allows two Cisco Nexus switches to appear to a downstream device as if it's a single switch. This allows the Nexus switches to work as per the IEEE standard, and at the same time adds resilience against a single switch failure.
The vpc command is that which enables this functionality on the port-channel interface of the Nexus switches.
You'll need the command if you're running vPC i.e., the physical links of the aggregate from the downstream device are distributed across both Nexus switches. If you're going to run standard port-channel i.e., all physical links from the downstream device connected to a single Nexus switch, then it's not needed.
There's some other configuration required to run vPC on the Nexus which you should be able to see if you execute the show running vpc command. You'll see feature vpc, vpc domain etc., that must all be configured prior to actually enabling the vpc command on a port-channel interface. If you say this is working then presumably that's already configured.
Regards

Adobe Bridge CC in the Cloud

I downloaded Bridge CC from the cloud, I succeeded in doing that, but the bridge CC doesn't appear in my program application. I also cann't download it again because it is already downloaded. Ihave Bridge CS6 and bridge CS5 in my program application. Do I have do de-install that first? But that is not a problem with PS6 and PS5 and PS CC.
Does anybody have an answer on this question?
Anne Marie

Thanks Curt.
Most users find the disadvantages outweigh the advantages of having it start at login.
It certainly does in CC.
Regards,
Ronald

How do you disable voice announcements on the Gusto 3 ?

How do you disable Voice Announcements on the Gusto 3 >

Thanks for reaching out to us, tobrien459! May I ask what readouts you are getting in order for me to make sure I provide you with the most accurate information?
I'm thinking you are looking for this:
From the Home screen, press the Left Soft Key
Menu > Settings > Accessibility > Easy Set-up.
2. Follow the screen prompts to choose settings for
Full Readout, Menu Readout, Digit Dial Readout,
Alert Readout, TXT Message Readout, Browser
Readout, and Flip Open & Talk
Let me know if this is what you need.
TamaraH_VZW
Follow us on Twitter @VZWSupport

Transformation issue, need to break the lines.

Hi,
i had requirement in which i need to read only headers in file and write it into single file.
so i used transformation activity in which i mapped only header. But my issue is all the header records are written in single line.
I need it in separate lines. Please guide me how to break the lines in xslt

Here there is a post about the same: https://forums.oracle.com/thread/505159
Please, share some sample input, desired output, as well as the XSL you already built, in case you need more help.
Regards
Luis F Heckler

When I try to disable cellular data in the settings for my apps it will toggle fine, but once I exit and go back in to the cellular settings its back on again all by itself.

I have had a problem with my iphone 4s for some time now but I have just been so busy to try and fix it. When I try to disable cellular data in the settings for my apps it will toggle fine, but once I exit and go back in to the cellular settings its back on again all by itself. However, even though it says the data is on, I can’t use the data when I don’t have wifi. I tried restoring my phone a few times and the last time I did that, it wouldn’t turn my service on so I had to talk with a Verizon agent for a long time trying to fix it and finally they simply sent me another phone. I thought hey new phone, this part will be fixed. However, I got my service to work but it’s still the same problem with the cellular data. I have just left it alone and not worried about it, but it’s still not fixed and thought I could ask on here if anyone had any ideas. It has something to do with the apps actually installed on the iphone. Apps like the mail, safari, settings, itunes apps, etc. All my other apps turn on and off just fine. Does anyone have any ideas?

Read the User's Guide... it covers how to backup and sync the device as designed.

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