BGP and convergence time

shake righa ssrigha at gmail.com
Fri May 14 07:54:01 CDT 2010


Apologies,

kindly ignore my earlier responce.

Rgrds,
Shake

On Fri, May 14, 2010 at 3:46 PM, shake righa <ssrigha at gmail.com> wrote:

> Believe have narrowed down problem to layer 2.
>
> A ping to address 224.0.0.5 shows no reply.
>
> Believe problme to do with blocking of multicast
>
> Regards,
> Shake
>
> On Fri, May 14, 2010 at 5:28 AM, Frank Bulk <frnkblk at iname.com> wrote:
>
>> What about IP SLA with some EEM?  This link may give you some ideas:
>> http://blog.ioshints.info/2008/01/ospf-default-route-based-on-ip-sla.html
>>
>> Frank
>>
>> -----Original Message-----
>> From: Jay Nakamura [mailto:zeusdadog at gmail.com]
>> Sent: Tuesday, May 11, 2010 1:35 PM
>> To: NANOG
>> Subject: BGP and convergence time
>>
>> So, we have two upstreams, both coming in on Ethernet.  One of our
>> switch crashed and rebooted itself.  Although we have other paths to
>> egress out the network, because the router's Ethernet interface didn't
>> go down, our router's BGP didn't realize the neighbor was down until
>> default BGP timeout was reached.  Our upstream connectivity was out
>> for couple minutes.
>>
>> I am looking for ways to detect neighbor being down faster so traffic
>> can be re-routed faster.  I can do BFD internally but the issue is how
>> the upstream is going to detect the outage and stop routing our
>> traffic to that downed link.  I have asked both of my upstreams and
>> one said they don't do anything like that, second upstream I am still
>> waiting on the answer.
>>
>> My question is, do other carriers do BFD or any other means to detect
>> the neighbor being down faster than normal BGP will allow?  (Both
>> upstreams are major telcos [AT&T and Qwest], so I think they are less
>> flexible than some others.)
>>
>> Or, has anyone succeeded in getting something done with those two
>> carriers?
>>
>> Thanks!
>>
>>
>>
>>
>



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