2011/11/28 Mark Tinka <[email protected]> > On Tuesday, November 29, 2011 12:06:28 AM Keegan Holley > wrote: > > > It's cleaner to have a route type for aggregates than a > > static null0 route with the same default preference of a > > static route. > > Why would it be cleaner? > > The static route is basically used to pull-up the aggregate > into BGP. This points to a Null interface on all BGP- > speaking routers, ensuring packets that arrive for subnets > not in iBGP or the IGP get dropped, and also announcing said > routes to eBGP neighbors. > > Works. Simple. Effective. >
You can also apply attributes directly to the aggregate. So you can set origin code, local pref etc. directly on the route. Also, from the non-technical side it's cleaner to know it's an aggregate as opposed to a static route doing something else. > > > Another is not having eBGP routes > > preferred over iBGP route. > > Your aggregates would be in your iBGP. Would you expect to > learn your aggregates from outside your routing domain? > That wasn't centered around aggregates and no. Some of us don't run gigantic intercontinental ISP's :) So yes us lowly Tier-II and Tier-III AS's may on occasion learn our own routes from an external connection. Also, just because the AS number is different doesn't mean it's not yours. It's better (and I fully admit that this is debatable) to have the iBGP vs. eBGP choice much lower in the selection process.. > > > At the risk of starting yet > > another trite cisco vs. juniper thread, what do you mean > > by preferred device? > > What I meant is if we were comparing a Cisco and a Juniper > and the Cisco turned to be more preferred save for this one > feature the Juniper had. > Agreed, this is a nothing feature. > > I wasn't implying Cisco are better than Juniper, or vice > versa. > > Actually I was. 6509/Nexus vs. EX8200, Cisco ME vs. EX4200, ASR vs. M/MX and CRS vs. T/TX are all different conversations. I thought you were alluding to something like that which I would have agreed with. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
