North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: BGP and aggregation
Actually I ran this way for a while as a primary. I had three sites attached via cogent entirely all announcing a /19 and the internally a /21 each and a couple /21's out of the primary location. In the main location was a 7507 and in the two other pops 6509's. We set ospf internally, set up bgp for the announcements at each site and used the no-export tag for the more specifics. Then gre tunnels:) for the internal. It worked and I pushed probably 45 to 50mb over the internal loops or gre tunnels. Not ideal but it worked. On Sun, 12 May 2002, Stephen J. Wilcox wrote: > > Interesting point there Scott.. we were discussing just that at a recent > IXP meeting I was at. Theres a number of different ways (well hacks) in > which you can keep connectivity between two halves of an AS network in the > event of a split. > > Is anyone out there actually doing something either this or similar to > keep two halves connected in the event of a split.. and have you actually > run successfully on your backup and maintained a reasonable throughput > (say 30 or 40Mbs) ? I'd be interested if anyone has a proven technique as > I want to implement something myself and dont really want to test it by > pulling the plug on some backbone links and waiting to see what happens! > > Steve > > On Sun, 12 May 2002, Scott Granados wrote: > > > > > Don't forget that if both sites use the same as even if the connection > > link drops they will not be able to see each other over the upstream > > provider as routers won't take the srutes from the same as. If this > > isn't a problem don't worry about it. If you wish to preserve > > connectivity between cities you should have a back-up link or use > > different as's or gre tunnels:). > > > > On Sat, 11 May 2002, Ralph Doncaster > > wrote: > > > > > > > > I have transit in 2 cities. I have a circuit connecting the 2 cities as > > > well. So far I've been using non-contiguous IPs, so there's been no > > > opportunity for aggregation. Having just received my /20 from ARIN, I'm > > > trying to plan my network. Lets say I split the /20 into 2 /21's, one for > > > each city. I'd like to announce the aggregate /20 instead of 2 /21's, as > > > long as the circuit connecting the 2 cities is working. If the circuit > > > goes down I want each city to announce the local /21. Is this > > > possible? (using either a Cisco router or Zebra) > > > > > > Ralph Doncaster > > > principal, IStop.com > > > div. of Doncaster Consulting Inc. > > > > > > > > >
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