On Mon, Jan 31, 2005 at 09:37:57AM -0800, Blaine Christian wrote:
Specifically, they have the ability to tickle a legacy cisco bug with AS path length. This bug was supposedly mitigated in code and I believe my previous company is still filtering AS path length (UUNET) of 100 or greater.
In recent years there have been issues with memory allocation on the order of path-length ~50. Similar to bogon filters, it is recommended to take a survey of sane path lengths before and your own needs before deploying. Potentially useful data in this regard is tracked by [suprise] cymru http://www.cymru.com/BGP/asnpalen01.html In cisco-land, the max as-length was an undocumented command until last year or so. a popular value appears to be in the 40-50 range from folks I know using it. Cheers, Joe -- RSUC / GweepNet / Spunk / FnB / Usenix / SAGE