On May 5, 2004, at 7:31 PM, Christopher L. Morrow wrote:
On Wed, 5 May 2004, Patrick W.Gilmore wrote:
On May 5, 2004, at 2:39 PM, Smith, Donald wrote:
No. The router stays up. The tool I use is very fast. It floods the GIGE to the point that that interface is basically unusable but the router itself stays up only the session is torn down. I did preformed these tests in a lab and did not have full bgp routing tables etc ... so your mileage may vary.
That is DAMNED impressive. I've never seen a router which can take a Gigabit of traffic to its CPU and stay up. What kind of router was this? You mentioned Juniper and Cisco before, but I know a cisco will fall over long before a gigabit and a Juniper either does or drops packets destined for the CPU (but keeps routing).
recieve-path acl and recieve-path-limits perhaps on a cisco will allow survival? Though if this is 'bgp' from a valid peer it seems likely to crunch it either way.
Does this mean you think a cisco would survive a gigabit of traffic from a "valid" peer directed at the CPU? I admit I have not tested this, but past experience with similar things would imply _any_ router cisco makes would fall over in such a situation - at best just wedging and not doing anything (pass packets, SMNP, SSH, etc.), and perhaps rebooting, depending upon IOS / model.
Perhaps it was rate limiting the # of packets which reached the CPU, and the session stayed up because the "magic" packet was dropped in the rate limiting?
That sees likely.
Agreed. Which makes the test ... not 100% valid. Hrmmm.... I wonder how many miscreants tried the MD5 thing and just sent 100K pps to the router to reset a session really fast, then failed 'cause most of their packets were dropped? -- TTFN, patrick