[nsp] bgp & ds3

[Joshua Smith]

hello all

i am encountering an odd issue - i have a 7513 with three BGP peers (one 
IBGP, two EBGP), the two EBGP sessions are on DS3 serial interfaces, the
IBGP is on a fastethernet interface connected by crossover to my other 7513.
the issue is that when one of the ds3 circuits goes down, all three bgp
sessions drop with hold-time expired.  i am not sure if this is 'supposed'
to happen, or if i have some hidden issue.  i know that the one session
should drop, but i don't understand why the other two do.

thanks

joshua
(sorry for the anonymization, but my employer prefers it)

#sho ver
Cisco Internetwork Operating System Software
IOS (tm) RSP Software (RSP-IK9O3SV-M), Version 12.2(13)T,  RELEASE SOFTWARE
(fc1)
TAC Support: http://www.cisco.com/tac
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Sat 16-Nov-02 00:33 by ccai
Image text-base: 0x60010948, data-base: 0x61D5C000

ROM: System Bootstrap, Version 12.0(10r)S1, RELEASE SOFTWARE (fc1)

router uptime is 7 weeks, 3 days, 18 hours, 12 minutes
System returned to ROM by reload at 16:37:18 EST Thu Dec 12 2002
System restarted at 16:39:21 EST Thu Dec 12 2002
System image file is "slot0:rsp-ik9o3sv-mz.122-13.T.bin"

cisco RSP8 (R7000) processor with 262144K/8216K bytes of memory.
R7000 CPU at 250Mhz, Implementation 39, Rev 2.1, 256KB L2, 2048KB L3 Cache
Last reset from power-on
G.703/E1 software, Version 1.0.
G.703/JT2 software, Version 1.0.
X.25 software, Version 3.0.0.
Bridging software.
Primary Rate ISDN software, Version 1.1.
Chassis Interface.
3 VIP4-80 RM7000 controllers (1 FastEthernet)(4 Ethernet)(2 Serial)(2
Channelized T3)(1 POS).
4 Ethernet/IEEE 802.3 interface(s)
1 FastEthernet/IEEE 802.3 interface(s)
5 Serial network interface(s)
1 Packet over SONET network interface(s)
2 Channelized T3 port(s)
2043K bytes of non-volatile configuration memory.

20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).
32768K bytes of Flash PCMCIA card at slot 1 (Sector size 128K).
16384K bytes of Flash internal SIMM (Sector size 256K).

Slave in slot 7 is running Cisco Internetwork Operating System Software
IOS (tm) RSP Software (RSP-DW-M), Version 12.2(13)T,  RELEASE SOFTWARE (fc1)
TAC Support: http://www.cisco.com/tac
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Fri 15-Nov-02 21:45 by ccai
Slave: Loaded from system
Slave: cisco RSP8 (R7000) processor with 262144K bytes of memory.

Configuration register is 0x2102


my bgp config:
router bgp my-AS
 no synchronization
 bgp router-id xxx.xxx.xxx.xxx
 no bgp fast-external-fallover
 bgp cluster-id 1079970877
 bgp log-neighbor-changes
 bgp bestpath scan-time 60
 bgp scan-time 60
 network xxx.xxx.xxx.xxx mask 255.255.252.0
 redistribute connected
 redistribute static
 neighbor xxx.xxx.xxx.xxx remote-as my-AS
 neighbor xxx.xxx.xxx.xxx update-source Loopback1978602
 neighbor xxx.xxx.xxx.xxx version 4
 neighbor xxx.xxx.xxx.xxx next-hop-self
 neighbor xxx.xxx.xxx.xxx send-community
 neighbor xxx.xxx.xxx.xxx soft-reconfiguration inbound
 neighbor xxx.xxx.xxx.xxx prefix-list Block_Out out
 neighbor nnn.nnn.nnn.nnn remote-as N
 neighbor nnn.nnn.nnn.nnn description Direct to N
 neighbor nnn.nnn.nnn.nnn version 4
 neighbor nnn.nnn.nnn.nnn next-hop-self
 neighbor nnn.nnn.nnn.nnn send-community
 neighbor nnn.nnn.nnn.nnn remove-private-AS
 neighbor nnn.nnn.nnn.nnn soft-reconfiguration inbound
 neighbor nnn.nnn.nnn.nnn route-map FROM-N in
 neighbor nnn.nnn.nnn.nnn route-map TO-N out
 neighbor yyy.yyy.yyy.yyy remote-as Y
 neighbor yyy.yyy.yyy.yyy description TO Y
 neighbor yyy.yyy.yyy.yyy ebgp-multihop 3
 neighbor yyy.yyy.yyy.yyy password mypassword
 neighbor yyy.yyy.yyy.yyy update-source Loopback1978602
 neighbor yyy.yyy.yyy.yyy version 4
 neighbor yyy.yyy.yyy.yyy next-hop-self
 neighbor yyy.yyy.yyy.yyy remove-private-AS
 neighbor yyy.yyy.yyy.yyy soft-reconfiguration inbound
 neighbor yyy.yyy.yyy.yyy prefix-list 100 out
 neighbor nyyy.yyy.yyy.yyy route-map FROM-Y in
 no auto-summary

Feb  3 03:23:17.793 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface 
Serial1/0/0, changed state to down
Feb  3 03:25:13.814 EST: %BGP-5-ADJCHANGE: neighbor nnn.nnn.nnn.nnn Down 
BGP Notification sent
Feb  3 03:25:13.814 EST: %BGP-3-NOTIFICATION: sent to neighbor 
nnn.nnn.nnn.nnn 4/0 (hold time expired) 0 bytes
Feb  3 03:26:50.591 EST: %BGP-5-ADJCHANGE: neighbor yyy.yyy.yyy.yyy.yyy
 Down BGP Notification sent
Feb  3 03:26:50.591 EST: %BGP-3-NOTIFICATION: sent to neighbor 
yyy.yyy.yyy.yyy 4/0 (hold time expired) 0 bytes
Feb  3 03:34:22.384 EST: %BGP-5-ADJCHANGE: neighbor xxx.xxx.xxx.xxx Down BGP
Notification sent
Feb  3 03:34:22.384 EST: %BGP-3-NOTIFICATION: sent to neighbor 
xxx.xxx.xxx.xxx 4/0 (hold time expired) 0 bytes
Feb  3 03:41:07.444 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Serial1/0/0, changed state to up
Feb  3 03:42:29.013 EST: %BGP-5-ADJCHANGE: neighbor xxx.xxx.xxx.xxx Up
Feb  3 03:42:44.753 EST: %BGP-5-ADJCHANGE: neighbor yyy.yyy.yyy.yyy Up
Feb  3 03:55:02.105 EST: %BGP-5-ADJCHANGE: neighbor nnn.nnn.nnn.nnn Up


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