North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: BGP Redistribution question
Hello. Redistribute ospf xx subnets has some unusual behavior compared to other redistribution mechanisms. Instead of dumping everything from ospf into the other routing protocol, it only does a subset of routes. (If I remember right, only "internal" routes.) I think the command you probably want is... Redistribute ospf 123 match internal external 1 external 2 Also, if you have nssa's, you may have to tack nssa-external on the end of that. Good luck, Ejay P.s. Unidrectional redistribution good. Bidirectional redistribution Bad > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of D Train > Sent: Thursday, August 05, 2004 10:09 AM > To: [email protected] > Subject: BGP Redistribution question > > > While looking into a routing issue, I found that one > of my routers wasn't passing one of my static routes, > being redist into ospf into bgp, and not sure as to > why. It has been a while since I have worked with BGP, > so I am a little rusty. The solution was for me to add > the following BGP network statement... network > 10.86.8.0 mask 255.255.248.0. If statics are being > redist info ospf, and ospf is basically being redist > into bgp, why did I have to have the network > statement. Why didn't it put it into BGP and pass it > along? > > Here is the scenario: > Router A: > ip route 10.86.8.0 255.255.248.0 10.86.138.14 > > ATL--CR6513A#ping 10.86.138.14 > success rate is 100 percent (5/5), round-trip > min/avg/max = 1/1/4 ms > > ATL -CR6513A#sh ip route 10.86.8.0 > Routing entry for 10.86.8.0/21 > Known via "static", distance 1, metric 0 > Redistributing via ospf 1 > Advertised by ospf 1 subnets > bgp 2 > Routing Descriptor Blocks: > * 10.86.138.14 > Route metric is 0, traffic share count is 1 > > ATL-CR6513A#sh ip ospf data ext 10.86.8.0 > OSPF Router with ID (10.86.194.5) (Process ID 1) > Type-5 AS External Link States > Routing Bit Set on this LSA > LS age: 898 > Options: (No TOS-capability, DC) > LS Type: AS External Link > Link State ID: 10.86.8.0 (External Network Number ) > Advertising Router: 10.86.194.2 > LS Seq Number: 80000D87 > Checksum: 0x3D49 > Length: 36 > Network Mask: /21 > Metric Type: 2 (Larger than any link state path) > TOS: 0 > Metric: 20 > Forward Address: 0.0.0.0 > External Route Tag: 0 > LS age: 554 > Options: (No TOS-capability, DC) > LS Type: AS External Link > Link State ID: 10.86.8.0 (External Network Number ) > Advertising Router: 10.86.194.5 > LS Seq Number: 80000D87 > Checksum: 0x2B58 > Length: 36 > Network Mask: /21 > Metric Type: 2 (Larger than any link state path) > TOS: 0 > Metric: 20 > Forward Address: 0.0.0.0 > External Route Tag: 0 > > ATL-CR6513A#sh ip bgp 10.86.8.0 > BGP routing table entry for 10.86.0.0/16, version > 1078065 > Paths: (2 available, best #2, table > Default-IP-Routing-Table) > Multipath: eBGP > Advertised to non peer-group peers: > 10.1.2.9 > 1, (aggregated by 1 10.1.254.253) > 10.1.2.9 from 10.1.2.9 (10.1.254.253) > Origin IGP, metric 0, localpref 100, valid, external, > atomic-aggregate, multipath > 1, (aggregated by 1 10.1.254.252) > 10.1.2.1 from 10.1.2.1 (10.1.254.252) > Origin IGP, metric 0, localpref 100, valid, external, > atomic-aggregate, multipath, best > > router ospf 1 > redistribute static subnets > router bgp 2 > no synchronization > network x.x.x.x > network y.y.y.y > network 10.86.8.0 mask 255.255.248.0 ***had to be > added for this to work, but wasn't present before > hand*** > redistribute connected route-map OSPF-Links > redistribute ospf 1 route-map WW-OSPF-Routes > neighbor 10.1.2.1 remote-as 1 > neighbor 10.1.2.1 advertisement-interval 1 > neighbor 10.1.2.9 remote-as 1 > neighbor 10.1.2.9 advertisement-interval 1 > maximum-paths 2 > no auto-summary > > route-map WW-OSPF-Routes permit 10 > set metric-type internal > > This is I was seeing on my Upstream Core router: > ATL -CR12406A#sh ip route 10.86.8.0 > Routing entry for 10.86.0.0/16 > Known via "bgp 1", distance 200, metric 0, type > locally generated > Routing Descriptor Blocks: > * directly connected, via Null0 > Route metric is 0, traffic share count is 1 > AS Hops 0, BGP network version > > This is what I was seeing after I add the network > statement: > > GAATL-WW1-CR12406A#sh ip bgp 10.86.8.0 > > BGP routing table entry for 10.86.8.0/21, version > 2210556 > > Paths: (2 available, best #2, Advertisements > suppressed by an aggregate.) > > Multipath: eBGP iBGP > Not advertised to any peer > 2 > 10.1.2.2 from 10.1.2.2 (10.86.194.5) > Origin IGP, metric 0, localpref 100, valid, external, > multipath > 2 > 10.1.2.6 from 10.1.2.6 (10.86.194.2) > Origin IGP, metric 0, localpref 100, valid, external, > multipath, best > > > > > > > > __________________________________ > Do you Yahoo!? > Yahoo! Mail Address AutoComplete - You start. We finish. > http://promotions.yahoo.com/new_mail
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