Route Management Best Practices

Tue Jan 31 06:38:32 UTC 2012

On Tuesday, January 31, 2012 01:01:30 AM Joe Marr wrote:

> I currently use static routes and tags on my edge routers
> to inject route into BGP. The tags correspond to
> communities that reflect how the routes are announced
> per region.

> I would love to heat from others on how they handle this.

We originate our allocations from our route reflectors. The 
route reflectors make sense for a number of reasons, e.g., 
they're always up, they aren't doing anything else, they 
aren't in the forwarding path, they aren't reachable from 
outside our AS, they're few enough to manage scalably, 
e.t.c.

Like you, we attach communities to all originated 
allocations as the route reflector is announcing them to all 
iBGP neighbors, and those communities are used to determine 
how the routes are announced to peers, upstreams and 
customers.

The problem with originating your routes at the edge 
(peering or customers) is you'll likely have more of these 
routers than route reflectors, so redundancy management of 
route origination will become a huge problem.

Also, failure of your edge routers is probably more likely 
than your route reflectors just by the very nature of their 
functions. This is why most advice is not to originate 
routes on routers that are providing inter-AS connectivity, 
as it could lead to blackholes due to backhaul link failure.

Cheers,

Mark.
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