Re: Anyone seen this kind of problem? SIP traffic not getting to destination but traceroute does

[Jack Bates <jbates () brightok net>]

On 11/9/2011 4:45 PM, Blake Hudson wrote:
> I'm not sure how an IP transit provider (who should be providing 
> routing/switching) screws up transport layer connections - looks like 
> they are arbitrarily "managing" client data. Just my $0.02. 

With today's routers, all sorts of weird things can go wrong, especially 
if it's a hardware failure.

I had an IO/FE go out on a 7200 (which is as software as you get) which 
attributed to a lot of weirdness. It started when the IGP updated state 
information on the IO card's FE, which shut down mpls switching on the 
router, but the LSP itself was still considered up. It then showed by 
freaking out the neighbor 7206 when we reboot the failing one (could no 
longer ping the loopback of the neighbor router with and without using 
the LSP, but all IGP was up and you could ping/telnet/ssh to any other 
IP ). Finally the  reboot itself showed the true issue (required 
multiple power cycles and a reset of the ata card to even load IOS in an 
unstable state).

I don't even want to think what happens when a high end router's 
linecard starts to fail.


Jack