//Disclaimer: I am using GNS3 for this example. This is the way I understand it, anyone else feel free to chime in: Think update source. router bgp 4 neighbor 10.0.4.5 remote-as 5 neighbor 10.0.4.5 update-source FastEthernet0/0 interface FastEthernet0/0 ip address 10.0.4.4 255.255.255.0 duplex auto speed auto standby 0 ip 10.0.4.254
how can I create a neighborship by sourcing the standby 0 IP? I can't. Let's look at router 5 on the other side interface FastEthernet0/0 ip address 10.0.4.5 255.255.255.0 duplex auto speed auto router bgp 5 no synchronization bgp log-neighbor-changes neighbor 10.0.1.1 remote-as 1 neighbor 10.0.4.254 remote-as 4 no auto-summary Let's debug BGP on R4 R4(config-router)#no *Mar 1 00:31:36.267: BGP: 10.0.4.5 passive open to 10.0.4.254 *Mar 1 00:31:36.271: BGP: 10.0.4.5 passive open failed - 10.0.4.254 is not update-source FastEthernet0/0's address (10.0.4.4) *Mar 1 00:31:36.271: BGP: 10.0.4.5 remote connection attempt failed, local address 10.0.4.254 R4(config-router)#no *Mar 1 00:31:38.255: BGP: 10.0.4.5 open active, local address 10.0.4.4 *Mar 1 00:31:38.311: BGP: 10.0.4.5 open failed: Connection refused by remote host, open active delayed 26388ms (35000ms max, 28% jitter) R4(config-router)#no ok it is complaining about 10.0.4.254 not being fa0/0's address. Fine, I will remove update source fa0/0 router bgp 4 no synchronization bgp log-neighbor-changes neighbor 10.0.4.2 remote-as 2 neighbor 10.0.4.3 remote-as 3 neighbor 10.0.4.5 remote-as 5 neighbor 10.0.4.5 update-source FastEthernet0/0 maximum-paths 3 no auto-summary no neighbor 10.0.4.5 update-source FastEthernet0/0 BGP: 10.0.4.5 rcvd OPEN w/ remote AS 5 *Mar 1 00:33:09.427: BGP: 10.0.4.5 went from OpenSent to OpenConfirm *Mar 1 00:33:09.427: BGP: 10.0.4.5 send message type 1, length (incl. header) 45 *Mar 1 00:33:09.475: BGP: 10.0.4.5 went from OpenConfirm to Established *Mar 1 00:33:09.475: %BGP-5-ADJCHANGE: neighbor 10.0.4.5 Up uh oh, it is working! Interesting.. I am in GNS3 but will lab it up at home on real hardware once I get there. This is not the behavior I expected. R5#sh ip bgp sum [...] Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 10.0.1.1 4 1 40 40 2 0 0 00:36:01 1 10.0.4.254 4 4 16 22 2 0 0 00:02:47 1 I also tested it with iBGP and the same behavior occured. I also failed over the HSRP address and made another node active as 10.0.4.254 and the adjacency did come back up on that router! I will try this out on real hardware once I get home and then report back. We had tried this in production 2 months ago using ASR1000s and could not get it working. Nick ________________________________ From: Samir Idris <[email protected]> To: Nick Bonifacio <[email protected]> Cc: Taqdir Singh <[email protected]>; "[email protected]" <[email protected]> Sent: Thursday, October 11, 2012 7:50 AM Subject: Re: [OSL | CCIE_RS] Hello team can we make bgp neighbor ship HSRP virtual IP ? Nick, Why cant we source from a virtual IP? Can you shed some light on the logic? Regards, Samir. On Thursday, October 11, 2012, Nick Bonifacio <[email protected]> wrote: > Hi Taqdir, > > You have to source from a physical interface and cannot source from a vIP. > Here is a link to "best practice" using HSRP and multihomed BGP environments: > > http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a0080093f2c.shtml > > > Thanks! > Nick > > ________________________________ > From: Taqdir Singh <[email protected]> > To: [email protected] > Sent: Thursday, October 11, 2012 3:16 AM > Subject: [OSL | CCIE_RS] Hello team can we make bgp neighbor ship HSRP > virtual IP ? > > Hello team can we make bgp neighborship with HSRP virtual IP ? > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit http://www.ipexpert.com/ > > Are you a CCNP or CCIE and looking for a job? Check out > http://www.platinumplacement.com/ > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit http://www.ipexpert.com/ > > Are you a CCNP or CCIE and looking for a job? Check out > http://www.platinumplacement.com/ > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > -- Samir Idris _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
