From: Reza Toghraee (reza@toghraee.com)
Date: Tue Oct 14 2008 - 16:44:32 ART
Put "no keepalive" on R6 Serial 0/0/0
It will fix. Since the R6 to BB1 connection is direct by default.
Reza
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sachin D
Sent: Tuesday, October 14, 2008 11:23 PM
To: Cisco certification
Subject: Troubleshooting EIGRP Neighbor Flapping
Hi Guys,
I am facing EIGRP neighbor flapping for one of my lab, There is no
reachability issue between the 2 neighbors hence physical cabling issues are
ruled out. Scanned google all steps mention there in troubleshooting are
verified for me
Below is the topology and problem, hope some one can help me on some
troubleshooting steps or problem I am facing
--------- --------------------
----------------
| R6 |______________| FR Cloud |_________| BB1 |
---------P2MP Phy int ------- 2P Sub int
--------------
Checked all K values at both the ends and they are matching
R6 Configs
R6#sh run int s0/0/0
Building configuration...
Current configuration : 154 bytes
!
interface Serial0/0/0
ip address 54.1.2.6 255.255.255.0
encapsulation frame-relay
frame-relay map ip 54.1.2.254 100
no frame-relay inverse-arp
end
R6#
R6#sh run | s eigrp
router eigrp 10
network 54.1.2.6 0.0.0.0
network 150.1.6.6 0.0.0.0
no auto-summary
R6#
BB Configurations
interface Serial0/0/0.100 point-to-point
description PVC 100 to Rack1
ip address 54.1.2.254 255.255.255.0
ipv6 address 2001:54:1:2::254/64
ipv6 address FE80::254 link-local
frame-relay interface-dlci 100
!
router eigrp 10
network 54.0.0.0
network 200.0.0.0 0.0.3.255
distribute-list EIGRP out
distribute-list prefix DENY_DEFAULT in
no auto-summary
no eigrp log-neighbor-changes
no eigrp log-neighbor-warnings
BB1#sh ip prefix-list DENY_DEFAULT
ip prefix-list DENY_DEFAULT: 2 entries
seq 5 deny 0.0.0.0/0
seq 10 permit 0.0.0.0/0 le 32
BB1#
BB1#sh ip access-lists EIGRP
Standard IP access list EIGRP
10 permit 200.0.0.0, wildcard bits 0.0.3.255
BB1#sh ip protocols
Routing Protocol is "eigrp 10"
Outgoing update filter list for all interfaces is EIGRP
Incoming update filter list for all interfaces is (prefix-list)
DENY_DEFAULT
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 10
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
54.0.0.0
200.0.0.0/22
Routing Information Sources:
Gateway Distance Last Update
Distance: internal 90 external 170
R6#sh ip protocols
Routing Protocol is "eigrp 10"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 10
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
54.1.2.6/32
150.1.6.6/32
Routing Information Sources:
Gateway Distance Last Update
(this router) 90 00:04:57
Distance: internal 90 external 170
R6#
Error Messages
*Oct 14 19:28:19.195: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
54.1.2.254(Serial0/0/0) is down: retry limit exceeded
R6#
*Oct 14 19:28:23.403: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
54.1.2.254(Serial0/0/0) is up: new adjacency
R6#
*Oct 14 19:29:42.915: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
54.1.2.254(Serial0/0/0) is down: retry limit exceeded
*Oct 14 19:29:43.107: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
54.1.2.254(Serial0/0/0) is up: new adjacency
R6#
*Oct 14 19:31:02.619: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
54.1.2.254(Serial0/0/0) is down: retry limit exceeded
R6#
*Oct 14 19:31:06.867: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
54.1.2.254(Serial0/0/0) is up: new adjacenc
*REACHABILITY TEST (Can ping the neighbo while adjacancy goes down)
*R6#ping 54.1.2.254 repeat 10000
Type escape sequence to abort.
Sending 10000, 100-byte ICMP Echos to 54.1.2.254, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*Oct 14 19:00:05.023: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
54.1.2.254(Serial0/0/0) is down: retry limit
exceeded!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*Oct 14 19:00:08.311: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
54.1.2.254(Serial0/0/0) is up: new adjacency!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.
Success rate is 99 percent (1389/1390), round-trip min/avg/max = 56/57/304
ms
Checked MTU size on both interfaces same
R6#sh int s0/0/0
Serial0/0/0 is up, line protocol is up
Hardware is GT96K Serial
Internet address is 54.1.2.6/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
BB1#sh int s0/0/0
Serial0/0/0 is up, line protocol is up
Hardware is GT96K Serial
Description: Serial to FRS
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
Regards
*
*
Blogs and organic groups at http://www.ccie.net
This archive was generated by hypermail 2.1.4 : Sat Nov 01 2008 - 15:35:21 ARST