BGP local-as not changing AS (similar config works on a different device)

[jpbourke]

Hi,

I am configuring a connection to Cogent at two sites.  I need to use local-as at both sites.  One site is working Ok, the other is not changing the local-as

Running  16.3.5c on ISR4331/K9

router bgp 65010
bgp router-id A.A.A.A
!
address-family ipv4 vrf vrfFixed-Cogent
redistribute static
neighbor B.B.B.B remote-as 174
neighbor B.B.B.B local-as 202013 no-prepend replace-as
neighbor B.B.B.B timers 5 15
neighbor B.B.B.B activate
neighbor B.B.B.B soft-reconfiguration inbound

#sho ip bgp vpnv4 vrf vrfFixed-Cogent summary
BGP router identifier A.A.A.A, local AS number 65010

Can anyone help ?

Thanks

john

[balaji.bandi]

how about other one working, Same IOS ? same hardware ?

can you post other one working to have look ? also show version and BGP outputs

[jpbourke]

The other is completely different, it is a Catalyst with IP SERVICES

router bgp 205019

address-family ipv4 vrf vrfFixed-Cogent
neighbor C.C.C.C remote-as 174
neighbor C.C.C.C local-as 202013 no-prepend replace-as dual-as
neighbor C.C.C.C description BGP session to Cogent
neighbor C.C.C.C timers 5 15
neighbor C.C.C.C activate
neighbor C.C.C.C send-community
neighbor C.C.C.C soft-reconfiguration inbound
neighbor C.C.C.C route-map rmCogent-public out
exit-address-family

[jpbourke]

Update

I cleared the BGP and I am now sending 23456

Apr 28 12:52:27 UTC: BGP: B.B.B.B active sending OPEN, version 4, my as: 23456, holdtime 15 seconds, ID DF197229

[Sergey Lisitsin]

That normally means that your neighbour doesn't support the 64-bit AS numbers. So, any 64-bit AS number in the path gets replaced with 23456.

[jpbourke]

Found the problem
BGP bug

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCva92216/?rfs=iqvred

[jpbourke]

Found the problem

BGP bug

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCva92216/?rfs=iqvred

Apr 28 15:08:14 UTC: BGP: B.B.B.B  active rcvd OPEN w/ optional parameter type 2 (Capability) len 14
Apr 28 15:08:14 UTC: BGP: B.B.B.B active OPEN has CAPABILITY code: 5, length 12
Apr 28 15:08:14 UTC: BGP: B.B.B.B active unrecognized capability code: 5
Apr 28 15:08:14 UTC: BGP: B.B.B.B active malformed/un-supported OPEN capability

[paul driver]

Hello

---

@jpbourke wrote:

Hi,

I am configuring a connection to Cogent at two sites.  I need to use local-as at both sites.  One site is working Ok, the other is not changing the local-as

router bgp 65010
bgp router-id A.A.A.A
!
address-family ipv4 vrf vrfFixed-Cogent
redistribute static
neighbor B.B.B.B remote-as 174
neighbor B.B.B.B local-as 202013 no-prepend replace-as
neighbor B.B.B.B timers 5 15
neighbor B.B.B.B activate
neighbor B.B.B.B soft-reconfiguration inbound

---

Are you wanting the router in ASN 174 to peer with the local-as number you have applied?
I would suggest not to use soft reconfiguration and use the route refresh capability instead it much less resource intensive on the router with large rib tables also append dual-as and then soft reset the bgp session which will initiate router refresh.

Example:

sh ip bgp neighbors | s Route refresh   <-- to check it your router and the peer supports RR, if so

router bgp 65010
no neighbor B.B.B.B soft-reconfiguration inbound

neighbor B.B.B.B local-as 202013 no-prepend replace-as  dual-as
exit

clear ip bgp vrf vrfFixed-Cogent ipv4 unicast 174 soft out
clear ip bgp vrf vrfFixed-Cogent ipv4 unicast 174 soft in