[c-nsp] Sanity check OSPF/BGP

[Aaron]

You didn't specify the platform or code version it is running. Would help
with platform specifics


On Thu, Oct 8, 2020 at 11:47 AM <aaron1 at gvtc.com> wrote:

> I wonder if bgp neighboring isn't timing out quickly enough for your
> satisfaction and holding routes for a few minutes
>
>
> -----Original Message-----
> From: cisco-nsp <cisco-nsp-bounces at puck.nether.net> On Behalf Of Drew
> Weaver
> Sent: Thursday, October 8, 2020 8:01 AM
> To: 'cisco-nsp at puck.nether.net' <cisco-nsp at puck.nether.net>
> Subject: [c-nsp] Sanity check OSPF/BGP
>
> Hello,
>
> I have two sets of core routers due to a transition period from one set to
> the other.
>
> I have noticed that when there is a connectivity disruption between the two
> sets of core routers and one upstream peering/edge router:
>
> Oct  7 12:01:14 EDT: %OSPF-5-ADJCHG: Process 1, Nbr <removed> on
> TenGigabitEthernet2/1 from FULL to DOWN, Neighbor Down: BFD node down
>
> <Two+ minutes of null routing traffic for no reason>
>
> Oct  7 12:03:29 EDT: %BGP-5-ADJCHANGE: neighbor <removed> Down BGP
> Notification sent
>
> What I expect to happen is:
>
>               The route to the peering edge router's loopback interface is
> withdrawn when OSPF/OSPFv3 closes.
>               The core router will close the BGP session when the route to
> the dead peering edge router is withdrawn and will begin using one of the 5
> other copies of the same route that it has.
>
> Things I have implemented to avoid this:
>
>               The peering edge router and the core routers peer with IP
> addresses that are only learnable via OSPF and aren't available in any
> other
> protocol. [It's not part of our IP space]
>
> I guess I just need a sanity check regarding whether my assumption that it
> shouldn't be null routing traffic for 2+ minutes if one of our peering edge
> routers gets hit by a meteor is correct since we have 5 peering edge
> routers.
>
> Thanks in advance friends,
> -Drew
>
>
>
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