From: kym blair (kymblair@xxxxxxxxxxx)
Date: Sat Aug 10 2002 - 06:50:50 GMT-3
Jason,
You've got two problems. You have a loopback address of 2.2.2.2 on both R1
and R2, and it's the highest loopback IP on both routers, so there will be
an ospf RID conflict.
After you solve that, I think you'll having a synchronization problem
between OSPF and BGP. Either add "no synch" to bgp on R1, or add "bgp
router-id X.X.X.X" to both routers where X.X.X.X is the same as the ospf RID
on each router (you can determine the ospf RIDs using "show ip ospf
database").
HTH, Kym
>From: Darryl Munro <Darryl.Munro@computerland.co.nz>
>Reply-To: Darryl Munro <Darryl.Munro@computerland.co.nz>
>To: "'Jim Brown'" <Jim.Brown@caselogic.com>, "'Jason Cash'"
><cash2001@swbell.net>, ccielab@groupstudy.com
>Subject: RE: BGP Problems
>Date: Sat, 10 Aug 2002 17:29:14 +1200
>
>It appears to me that this BGP peer is being formed over a P2P connection
>and the neighbor statements are to IP address's on directly connected
>networks, hence there is no need for update-source command or ebgp-multihop
>commands. There would seem to be something else wrong here and I can't see
>what is wrong with the config.
>
>Here is a really good link that may help you with some more troubleshooting
>techniques.
>
>http://www.cisco.com/networkers/nw01/pres/preso/RoutingandSwitchingTechnolog
>ies/RST-310.pdf
>
>Cheers
>
>
>-----Original Message-----
>From: Jim Brown [mailto:Jim.Brown@caselogic.com]
>Sent: Saturday, 10 August 2002 2:51 p.m.
>To: 'Jason Cash'; ccielab@groupstudy.com
>Subject: RE: BGP Problems
>
>Jason,
>
>BGP by default doesn't use the loopback like OSPF. You must specify the
>source address for your BGP advertisement with the 'update source' command
>on the neighbor statement.
>
>When advertising between EBGP peers you must also include the 'EBGP
>multihop' statement on the neighbor to account for the additional hops to
>the loopback address.
>
>This statement is not necessary for advertisements between IBGP peers,
>obviously this is why it is called EBGP multihop and not BGP multihop.
>
>
>
>-----Original Message-----
>From: Jason Cash [mailto:cash2001@swbell.net]
>Sent: Friday, August 09, 2002 8:37 PM
>To: ccielab@groupstudy.com
>Subject: BGP Problems
>
>
>Error msg recv'd on R1:
>02:19:03: %BGP-3-NOTIFICATION: sent to neighbor 192.1.1.2 2/3 (BGP
>identifier wrong)
>4 bytes 02020202
>
>Error msg recv'd on R2:
>02:17:55: %BGP-3-NOTIFICATION: sent to neighbor 192.1.1.1 2/3 (BGP
>identifier wrong)
>4 bytes 02020202
>
>Also, the 'sh ip bgp nei' from each router. For whatever reason, it is
>not obtaining the loopback address(es)
>
>r1#sh ip bgp nei
>BGP neighbor is 192.1.1.2, remote AS 200, external link
> BGP version 4, remote router ID 0.0.0.0
> BGP state = Idle
> Last read 00:00:08, hold time is 180, keepalive interval is 60 seconds
> Received 8 messages, 3 notifications, 0 in queue
> Sent 8 messages, 5 notifications, 0 in queue
> Route refresh request: received 0, sent 0
> Default minimum time between advertisement runs is 30 seconds
>
> For address family: IPv4 Unicast
> BGP table version 1, neighbor version 0
> Index 1, Offset 0, Mask 0x2
> 0 accepted prefixes consume 0 bytes
> Prefix advertised 0, suppressed 0, withdrawn 0
> Number of NLRIs in the update sent: max 0, min 0
>
> Connections established 0; dropped 0
> Last reset never
> No active TCP connection
>
>r2#sh ip bgp nei
>BGP neighbor is 192.1.1.1, remote AS 100, external link
> BGP version 4, remote router ID 0.0.0.0
> BGP state = Active
> Last read 00:00:08, hold time is 180, keepalive interval is 60 seconds
> Received 6 messages, 4 notifications, 0 in queue
> Sent 6 messages, 2 notifications, 0 in queue
> Route refresh request: received 0, sent 0
> Default minimum time between advertisement runs is 30 seconds
>
> For address family: IPv4 Unicast
> BGP table version 1, neighbor version 0
> Index 1, Offset 0, Mask 0x2
> 0 accepted prefixes consume 0 bytes
> Prefix advertised 0, suppressed 0, withdrawn 0
> Number of NLRIs in the update sent: max 0, min 0
>
> Connections established 0; dropped 0
> Last reset never
> No active TCP connection
>
>Configs: (Very simple)
>
>R1
>version 12.2
>no service single-slot-reload-enable
>service timestamps debug uptime
>service timestamps log uptime
>no service password-encryption
>service udp-small-servers
>service tcp-small-servers
>!
>hostname r1
>!
>logging rate-limit console 10 except errors
>!
>ip subnet-zero
>no ip finger
>no ip domain-lookup
>!
>no ip dhcp-client network-discovery
>!
>interface Loopback0
> ip address 1.1.1.1 255.255.255.0
>!
>interface Loopback1
> ip address 2.2.2.2 255.255.255.0
>!
>interface Loopback2
> no ip address
>!
>interface Loopback3
> no ip address
>!
>interface Loopback4
> no ip address
>!
>interface Ethernet0
> no ip address
> no ip route-cache
> no ip mroute-cache
>!
>interface Serial0
> ip address 192.1.1.1 255.255.255.0
> no ip route-cache
> no ip mroute-cache
>!
>interface Serial1
> ip address 193.1.1.1 255.255.255.0
> no ip route-cache
> no ip mroute-cache
>!
>router bgp 100
> bgp log-neighbor-changes
> neighbor 192.1.1.2 remote-as 200
>!
>ip kerberos source-interface any
>ip classless
>no ip http server
>!
>!
>alias exec shi sh ip int brief
>!
>line con 0
> exec-timeout 0 0
> transport input none
>line aux 0
> transport input all
>line vty 0 4
> login
>!
>end
>
>R2
>version 12.2
>no service single-slot-reload-enable
>service timestamps debug uptime
>service timestamps log uptime
>no service password-encryption
>service udp-small-servers
>service tcp-small-servers
>!
>hostname r2
>!
>logging rate-limit console 10 except errors
>!
>ip subnet-zero
>no ip finger
>no ip domain-lookup
>!
>no ip dhcp-client network-discovery
>!
>!
>!
>!
>interface Loopback0
> ip address 2.2.2.2 255.255.255.0
> ip ospf network point-to-point
>!
>interface Ethernet0
> no ip address
> no ip route-cache
> no ip mroute-cache
>!
>interface Serial0
> ip address 192.1.1.2 255.255.255.0
> no ip route-cache
> no ip mroute-cache
> clockrate 500000
>!
>interface Serial1
> ip address 194.1.1.2 255.255.255.0
> no ip route-cache
> no ip mroute-cache
> clockrate 500000
>!
>router ospf 1
> log-adjacency-changes
> passive-interface Serial0
> network 192.1.1.0 0.0.0.255 area 0
> network 194.1.1.0 0.0.0.255 area 0
>!
>router bgp 200
> no synchronization
> bgp log-neighbor-changes
> neighbor 192.1.1.1 remote-as 100
>!
>ip kerberos source-interface any
>ip classless
>no ip http server
>!
>!
>alias exec shi sh ip int brief
>!
>line con 0
> exec-timeout 60 0
> transport input none
>line aux 0
> transport input all
>line vty 0 4
> login
>!
>end
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:48:22 GMT-3