[rbak-nsp] SEOS 6.4.1.1 and iBGP problem

[Blake Willis]

Hi Marcin,

Have a look at 'show bgp neighbor' for the IP of the bouncing neighbor  
on both boxes.  If the address families (& some capabilies) don't  
match or aren't supported by one of the neighbors, the session might  
not come up.  You should see something like this on both sides (this  
is from one of my boxes):

   CapSent: refresh, 4byteAS, unicast, vpn, restart
   CapRcvd: refresh, 4byteAS, unicast, vpn, restart (time 120, flags  
0x0)

   Address family: ipv4 unicast
   Address family: ipv4 vpn

As a first guess, you might try explicitly disabling the IPv6 AFI for  
the IPv4 neighbor on the new box running 6.4:

neighbor 195.66.73.253 internal
  no address-family ipv6 unicast

You can also use 'show bgp neighbor' to see malformed messages,  
resets, etc.

Once you figure out which capability the old SEOS doesn't like, you  
may be able to disable it on the new box with the "send" or "address- 
family" config statements. Perhaps the new SEOS has a "capability"  
knob as well?

Good luck.

  -Blake

---
  Blake Willis
  Network Architect
  iBrowse