Re: Troubleshooting EIGRP Neighbor Flapping

From: Sachin D (networker.ccie@gmail.com)
Date: Tue Oct 14 2008 - 16:32:45 ART


No, This is real LAB

BB1#sh ver
Cisco IOS Software, 2800 Software (C2800NM-ADVENTERPRISEK9-M), Version
12.4(13a), RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Tue 06-Mar-07 17:01 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)

BB1 uptime is 3 hours, 15 minutes
System returned to ROM by reload at 16:24:45 UTC Tue Oct 14 2008
System restarted at 09:26:04 PDT Tue Oct 14 2008
System image file is "flash:c2800nm-adventerprisek9-mz.124-13a.bin"

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found
at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco 2811 (revision 53.50) with 223232K/38912K bytes of memory.
Processor board ID FTX1108A1E8
6 FastEthernet interfaces
2 Serial(sync/async) interfaces
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62720K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102

BB1#

R6#sh ver
Cisco IOS Software, 2800 Software (C2800NM-ADVENTERPRISEK9-M), Version
12.4(13a), RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Tue 06-Mar-07 17:01 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)

R6 uptime is 3 hours, 16 minutes
System returned to ROM by reload at 16:19:05 UTC Tue Oct 14 2008
System image file is "flash:c2800nm-adventerprisek9-mz.124-13a.bin"

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found
at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco 2821 (revision 53.50) with 223232K/38912K bytes of memory.
Processor board ID FTX1105A036
4 FastEthernet interfaces
2 Gigabit Ethernet interfaces
2 Serial(sync/async) interfaces
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62720K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102

Regards

On Wed, Oct 15, 2008 at 12:57 AM, Anthony Faria <tfaria72@gmail.com> wrote:

> Is this on dynamips?
>
> On Tue, Oct 14, 2008 at 12:23 PM, Sachin D <networker.ccie@gmail.com>wrote:
>
>> 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
>>
>> _______________________________________________________________________
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This archive was generated by hypermail 2.1.4 : Sat Nov 01 2008 - 15:35:21 ARST