From: ying c (bf5tgh1@xxxxxxxxx)
Date: Sat Aug 10 2002 - 10:52:56 GMT-3
Jason,
If you look closely, you have 2.2.2.2 appeared in both
r1 and r2, which means both r1 and r2 are using
2.2.2.2 ad their RID. If you get rid off loopback1
from r1, it should solve your problem. If you want to
keep 2.2.2.2 in both r1 and r2 for whatever reasons,
you should use 'bgp router-id' command to hardcode the
RID.
Chang
--- Darryl Munro <Darryl.Munro@computerland.co.nz>
wrote:
> 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
> !
>
=== message truncated ===
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:48:22 GMT-3