[c-nsp] %BGP-6-MSGDUMP_LIMIT: unsupported or mal-formatted message

[Saku Ytti]

On (2013-11-26 12:16 +0100), Antonio Prado wrote:
> 
> if I set the maxas-limit, whenever the router receives a longer path, it
> complains:
> 
> 020250: Nov 26 12:09:52: %BGP-6-MSGDUMP_LIMIT: unsupported or
> mal-formatted message received from xx.xx.xxx.243:

I'm guessing this might happen because max-prefix bites while packet is being
received. So remaining packet is incomplete and thus invalid.

I'm not 100% sure about this, but if you put that hexdump through 'text2pcap',
I'm betting it won't be recognized as BGP until you fix the 'size' bytes.

Interestingly, I don't believe this behaviour could be seen in IOS-XR or JunOS
or such, since it's quite untypical for userland process to start processing
packet before it's received. But IOS specifically has dedicated TCP/IP
implementation for BGP and another implementation for rest of the system.
-- 
  ++ytti