[j-nsp] BGP Graceful Restart

[Gary Tate]

Oh forgot to mention.  Filters are in the PFE and they are preserved.  
The whole forwarding plane is preserved cos, filters policers etc.

Gary

On Sep 22, 2004, at 8:34 PM, Gary Tate wrote:

> The helper router keeps track of updates while the restarting router 
> brings up rpd and restarts sessions.  Routing tables are then 
> synchronized so it does not matter in this case.  Network state is 
> retrieved and no packets are lost during this process.
>
> The network is not aware of the change in state of the restarting 
> router only the adjacent helper or peering routers.  If the restarting 
> router fails to come out of restart (restart timers) then the helper 
> routers will act accordingly, as if the router had gone down.
>
> Gary Tate
>
> On Sep 22, 2004, at 3:49 PM, Wayne E. Bouchard wrote:
>
>> If an update is missed and the routing table gets out of sync during
>> the switchover process or an access list manages to get bypassed, then
>> yes, it matters. The question is how MUCH does it matter?
>>
>> I'd still rather have that than nothing at all. For me, I can more
>> easily deal with a moment or two of oddities than 5 to 10 minutes as
>> things resynchronize.
>>
>> -Wayne
>>
>> On Wed, Sep 22, 2004 at 02:19:25PM -0700, Harry Reynolds wrote:
>>> I believe it is expected that IGP adjacencies and BGP sessions will 
>>> bounce
>>> as the new RE takes over. We do not replicate protocol state between 
>>> the
>>> REs. The goal of GR is not to preserve the control plane, I.e., to 
>>> keep an
>>> adjacency up. The goal is to permit forwarding while the control 
>>> plane
>>> restarts. Put another way, I think it a far better test to generate 
>>> some
>>> traffic over the BGP/IS-IS session/adjacencies and see what happens 
>>> to
>>> traffic flow during RE removal. If an adjacencies bounces, and no 
>>> packets
>>> are lost, then does it really matter?
>>>
>>>
>>>
>>> HTHs
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: juniper-nsp-bounces at puck.nether.net
>>>> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of
>>>> Khawaja, Kashif
>>>> Sent: Wednesday, September 22, 2004 2:11 PM
>>>> To: juniper-nsp at puck.nether.net
>>>> Subject: [j-nsp] BGP Graceful Restart
>>>>
>>>> Hi All:
>>>>
>>>> Trying to test Graceful Restarts for different protocols and
>>>> seem to be having a little trouble getting it to work.
>>>> I have an M40 and M160 connected to each other and running
>>>> isis and bgp.
>>>> If I were to pull the active RE on the 160 the isis and bgp
>>>> adjacency bounce. I have the following configuration in on
>>>> both the routers:
>>>> routing-options {
>>>>     graceful-restart;
>>>>     static {
>>>>         route 172.16.0.0/16 next-hop 172.19.253.1;
>>>>     }
>>>> }
>>>>
>>>> And also the RE switchover config in for the 160.
>>>>
>>>> chassis {
>>>>     redundancy {
>>>>         failover on-loss-of-keepalives;
>>>>         graceful-switchover {
>>>>             enable;
>>>>         }
>>>>     }
>>>> }
>>>>
>>>> Am I missing something?
>>>>
>>>> Thanks.
>>>> Kashif.
>>>> _______________________________________________
>>>> juniper-nsp mailing list juniper-nsp at puck.nether.net
>>>> http://puck.nether.net/mailman/listinfo/juniper-nsp
>>>>
>>>
>>> _______________________________________________
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>>
>> ---
>> Wayne Bouchard
>> web at typo.org
>> Network Dude
>> http://www.typo.org/~web/
>> _______________________________________________
>> juniper-nsp mailing list juniper-nsp at puck.nether.net
>> http://puck.nether.net/mailman/listinfo/juniper-nsp
>>
>