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Re: [RRG] BGP Graceful Restart (was Re: Geoff Huston's article ...)
On Jun 20, 2007, at 2:39 PM, Tony Li wrote:
The presumption with GR is that a router advertising its restart
capabilities will have a forwarding plane that will continue to
reliably forward during a failure in the control plane. If it does
not do this, then it will either blackhole or misroute traffic,
which is obviously not good.
Note that for GR between IBGP peers, this potential issue is
reduced. That's because a control plane failure which is serious
enough to affect the forwarding plane is likely to also take out the
IGP. Since IBGP routes are typically resolved through the peer's
loopback address which is learned through the IGP, an IGP failure
will have the effect of invalidating dependent IBGP routes,
regardless of their GR status.
But this is quite a tangent.
--John
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