From: Darryl Munro (Darryl.Munro@xxxxxxxxxxxxxxxxxx)
Date: Sat Aug 10 2002 - 02:29:14 GMT-3
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Prefix advertised 0, suppressed 0, withdrawn 0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
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