From: Bob Sinclair (bob@bobsinclair.net)
Date: Tue Oct 14 2008 - 16:40:00 ART
Sachin,
Since you do not have a neighbor statement, EIGRP is multicasting, yet
you do not have a broadcast keyword on your frame map of R6 S0/0/0.
Could that be it?
HTH,
-Bob Sinclair CCIE 10427
www.netmasterclass.net
Sachin D 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
> *
> *
>
>
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