Hi, I'm doing a lab and I encounter an issue with EIGRP where my EIGRP neighbor keep flapping. Here is the messages:
*Feb 17 20:40:46.121: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 172.16.35.5 (FastEthernet0/0.60) is down: Interface Goodbye received
*Feb 17 20:40:46.169: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 172.16.35.5 (FastEthernet0/0.60) is up: new adjacency
*Feb 17 20:42:05.683: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 172.16.35.5 (FastEthernet0/0.60) is down: retry limit exceeded
*Feb 17 20:42:10.179: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 172.16.35.5 (FastEthernet0/0.60) is up: new adjacency
*Feb 17 20:43:29.697: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 172.16.35.5 (FastEthernet0/0.60) is down: retry limit exceeded
*Feb 17 20:43:30.066: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 172.16.35.5 (FastEthernet0/0.60) is up: new adjacency
*Feb 17 20:44:49.584: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 172.16.35.5 (FastEthernet0/0.60) is down: retry limit exceeded
*Feb 17 20:44:53.791: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 172.16.35.5 (FastEthernet0/0.60) is up: new adjacency
It is a large lab, but I will point out the routers with this issues:
R3 is connect to Sw1 and Sw1 connects to R5
R3 config:
interface FastEthernet0/0
no ip address
speed auto
full-duplex
!
interface FastEthernet0/0.50
encapsulation dot1Q 50
ip address 172.16.30.3 255.255.255.0
ip irdp
ip irdp multicast
ip irdp maxadvertinterval 20
ip irdp minadvertinterval 20
ip irdp holdtime 60
ip irdp preference 100
shutdown
!
interface FastEthernet0/0.60
encapsulation dot1Q 60
ip address 172.16.35.3 255.255.255.128
!
router eigrp 100
redistribute eigrp 300
redistribute rip
network 172.16.35.3 0.0.0.0
default-metric 10000 100 255 1 1500
auto-summary
!
router eigrp 300
redistribute rip
network 172.16.34.3 0.0.0.0
default-metric 10000 100 255 1 1500
auto-summary
!
router rip
version 2
redistribute eigrp 100 metric 1
redistribute eigrp 300 metric 1
passive-interface default
no passive-interface Serial0/0.123
network 172.16.0.0
neighbor 172.16.123.1
!
Switch1
interface FastEthernet0/3
description R3
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 50,60
switchport mode trunk
switchport nonegotiate
duplex full
!
interface FastEthernet0/5
description R5
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,60
switchport mode trunk
switchport nonegotiate
duplex full
Router 5
interface FastEthernet0/0
no ip address
speed auto
full-duplex
!
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip address 172.16.10.5 255.255.255.192
!
interface FastEthernet0/0.60
encapsulation dot1Q 60
ip address 172.16.35.5 255.255.255.0
!
router eigrp 100
network 172.16.35.5 0.0.0.0
auto-summary
!
router eigrp 200
redistribute connected route-map L5551
network 172.16.10.0 0.0.0.255
network 172.16.200.12 0.0.0.3
default-metric 10000 100 255 1 1500
auto-summary
neighbor 172.16.10.1 FastEthernet0/0.10
neighbor 172.16.10.6 FastEthernet0/0.10
!
Here are some show command
R3
Routing Protocol is "eigrp 100"
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
Default redistribution metric is 10000 100 255 1 1500
Redistributing: eigrp 100, eigrp 300, rip
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is in effect
Maximum path: 4
Routing for Networks:
172.16.35.3/32
Routing Information Sources:
Gateway Distance Last Update
Distance: internal 90 external 170
R3# sh int f0/0
FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is 0014.a92f.7680 (bia 0014.a92f.7680)
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 1 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
2648 packets input, 193930 bytes
Received 2291 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
3744 packets output, 352763 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
80 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Debug on R3
R3#debug ip packet 101 detail
IP packet debugging is on (detailed) for access list 101
R3#
*Feb 17 20:55:55.760: IP: s=172.16.34.3 (local), d=224.0.0.10 (Serial0/0.34), len 60, sending broad/multicast, proto=88
*Feb 17 20:55:57.243: IP: s=172.16.35.3 (local), d=224.0.0.10 (FastEthernet0/0.60), len 60, sending broad/multicast, proto=88
*Feb 17 20:55:57.247: IP: s=172.16.35.5 (FastEthernet0/0.60), d=224.0.0.10, len 60, rcvd 2, proto=88
*Feb 17 20:55:57.251: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 172.16.35.5 (FastEthernet0/0.60) is up: new adjacency
*Feb 17 20:55:57.251: IP: s=172.16.35.3 (local), d=224.0.0.10 (FastEthernet0/0.60), len 60, sending broad/multicast, proto=88
*Feb 17 20:55:57.251: IP: tableid=0, s=172.16.35.5 (FastEthernet0/0.60), d=172.16.35.3 (FastEthernet0/0.60), routed via RIB
*Feb 17 20:55:57.255: IP: s=172.16.35.5 (FastEthernet0/0.60), d=172.16.35.3 (FastEthernet0/0.60), len 40, rcvd 3, proto=88
*Feb 17 20:55:57.259: IP: s=172.16.35.3 (local), d=172.16.35.5 (FastEthernet0/0.60), len 40, sending, proto=88
*Feb 17 20:55:57.259: IP: s=172.16.35.5 (FastEthernet0/0.60), d=224.0.0.10, len 77, rcvd 2, proto=88
*Feb 17 20:55:57.263: IP: s=172.16.35.5 (FastEthernet0/0.60), d=224.0.0.10, len 40, rcvd 2, proto=88
*Feb 17 20:55:57.267: IP: s=172.16.35.3 (local), d=224.0.0.10 (FastEthernet0/0.60), len 77, sending broad/multicast, proto=88
*Feb 17 20:55:57.267: IP: s=172.16.35.3 (local), d=224.0.0.10 (FastEthernet0/0.60), len 857, sending broad/multicast, proto=88
*Feb 17 20:55:59.254: IP: tableid=0, s=172.16.35.5 (FastEthernet0/0.60), d=172.16.35.3 (FastEthernet0/0.60), routed via RIB
*Feb 17 20:55:59.254: IP: s=172.16.35.5 (FastEthernet0/0.60), d=172.16.35.3 (FastEthernet0/0.60), len 40, rcvd 3, proto=88
*Feb 17 20:55:59.262: IP: s=172.16.35.3 (local), d=172.16.35.5 (FastEthernet0/0.60), len 40, sending, proto=88
*Feb 17 20:56:00.480: IP: s=172.16.34.3 (local), d=224.0.0.10 (Serial0/0.34), len 60, sending broad/multicast, proto=88
*Feb 17 20:56:01.506: IP: s=172.16.35.5 (FastEthernet0/0.60), d=224.0.0.10, len 60, rcvd 2, proto=88
*Feb 17 20:56:01.850: IP: s=172.16.35.3 (local), d=224.0.0.10 (FastEthernet0/0.60), len 60, sending broad/multicast, proto=88
*Feb 17 20:56:02.255: IP: tableid=0, s=172.16.35.5 (FastEthernet0/0.60), d=172.16.35.3 (FastEthernet0/0.60), routed via RIB
*Feb 17 20:56:02.255: IP: s=172.16.35.5 (FastEthernet0/0.60), d=172.16.35.3 (FastEthernet0/0.60), len 40, rcvd 3, proto=88
*Feb 17 20:56:02.263: IP: s=172.16.35.3 (local), d=172.16.35.5 (FastEthernet0/0.60), len 40, sending, proto=88
R5 Show commands
Routing Protocol is "eigrp 100"
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 100
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is in effect
Maximum path: 4
Routing for Networks:
172.16.35.5/32
Routing Information Sources:
Gateway Distance Last Update
Distance: internal 90 external 170
R5(config-if)#do sh int f0/0
FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is 0012.da88.4fc0 (bia 0012.da88.4fc0)
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 1000 bits/sec, 1 packets/sec
5252 packets input, 501733 bytes
Received 628 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
7726 packets output, 659302 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
4 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
R5 Debug
R5#debug ip packet 101 det
IP packet debugging is on (detailed) for access list 101
R5#
*Mar 1 02:40:13.787: IP: s=172.16.10.5 (local), d=172.16.10.1 (FastEthernet0/0.10), len 60, sending, proto=88
*Mar 1 02:40:13.787: IP: s=172.16.10.5 (local), d=172.16.10.6 (FastEthernet0/0.10), len 60, sending, proto=88
*Mar 1 02:40:14.464: IP: tableid=0, s=172.16.35.3 (FastEthernet0/0.60), d=172.16.35.5 (FastEthernet0/0.10), routed via RIB
*Mar 1 02:40:14.468: IP: s=172.16.35.3 (FastEthernet0/0.60), d=172.16.35.5 (FastEthernet0/0.10), g=172.16.10.1, len 40, forward, proto=88
*Mar 1 02:40:14.488: IP: s=172.16.35.5 (local), d=172.16.35.3 (FastEthernet0/0.60), len 40, sending, proto=88
*Mar 1 02:40:15.077: IP: s=172.16.35.5 (local), d=224.0.0.10 (FastEthernet0/0.60), len 60, sending broad/multicast, proto=88
*Mar 1 02:40:15.129: IP: tableid=0, s=172.16.10.6 (FastEthernet0/0.10), d=172.16.10.5 (FastEthernet0/0.10), routed via RIB
*Mar 1 02:40:15.129: IP: s=172.16.10.6 (FastEthernet0/0.10), d=172.16.10.5 (FastEthernet0/0.10), len 60, rcvd 3, proto=88
*Mar 1 02:40:15.289: IP: tableid=0, s=172.16.10.1 (FastEthernet0/0.10), d=172.16.10.5 (FastEthernet0/0.10), routed via RIB
*Mar 1 02:40:15.289: IP: s=172.16.10.1 (FastEthernet0/0.10), d=172.16.10.5 (FastEthernet0/0.10), len 60, rcvd 3, proto=88
*Mar 1 02:40:16.102: IP: s=172.16.35.3 (FastEthernet0/0.60), d=224.0.0.10, len 60, rcvd 2, proto=88
*Mar 1 02:40:16.531: IP: s=172.16.200.13 (local), d=224.0.0.10 (Loopback2013), len 60, sending broad/multicast, proto=88
*Mar 1 02:40:16.531: IP: s=172.16.200.13 (Loopback2013), d=224.0.0.10, len 60, rcvd 2, proto=88
*Mar 1 02:40:18.146: IP: s=172.16.10.5 (local), d=172.16.10.1 (FastEthernet0/0.10), len 60, sending, proto=88
*Mar 1 02:40:18.146: IP: s=172.16.10.5 (local), d=172.16.10.6 (FastEthernet0/0.10), len 60, sending, proto=88
*Mar 1 02:40:19.464: IP: tableid=0, s=172.16.35.3 (FastEthernet0/0.60), d=172.16.35.5 (FastEthernet0/0.10), routed via RIB
*Mar 1 02:40:19.468: IP: s=172.16.35.3 (FastEthernet0/0.60), d=172.16.35.5 (FastEthernet0/0.10), g=172.16.10.1, len 40, forward, proto=88
*Mar 1 02:40:19.488: IP: s=172.16.35.5 (local), d=172.16.35.3 (FastEthernet0/0.60), len 40, sending, proto=88
*Mar 1 02:40:19.849: IP: tableid=0, s=172.16.10.1 (FastEthernet0/0.10), d=172.16.10.5 (FastEthernet0/0.10), routed via RIB
*Mar 1 02:40:19.849: IP: s=172.16.10.1 (FastEthernet0/0.10), d=172.16.10.5 (FastEthernet0/0.10), len 60, rcvd 3, proto=88
*Mar 1 02:40:19.945: IP: s=172.16.35.5 (local), d=224.0.0.10 (FastEthernet0/0.60), len 60, sending broad/multicast, proto=88
*Mar 1 02:40:20.009: IP: tableid=0, s=172.16.10.6 (FastEthernet0/0.10), d=172.16.10.5 (FastEthernet0/0.10), routed via RIB
*Mar 1 02:40:20.009: IP: s=172.16.10.6 (FastEthernet0/0.10), d=172.16.10.5 (FastEthernet0/0.10), len 60, rcvd 3, proto=88
*Mar 1 02:40:20.698: IP: s=172.16.35.3 (FastEthernet0/0.60), d=224.0.0.10, len 60, rcvd 2, proto=88
*Mar 1 02:40:20.794: IP: s=172.16.200.13 (local), d=224.0.0.10 (Loopback2013), len 60, sending broad/multicast, proto=88
*Mar 1 02:40:20.794: IP: s=172.16.200.13 (Loopback2013), d=224.0.0.10, len 60, rcvd 2, proto=88
*Mar 1 02:40:22.485: IP: s=172.16.10.5 (local), d=172.16.10.1 (FastEthernet0/0.10), len 60, sending, proto=88
*Mar 1 02:40:22.485: IP: s=172.16.10.5 (local), d=172.16.10.6 (FastEthernet0/0.10), len 60, sending, proto=88
*Mar 1 02:40:24.384: IP: tableid=0, s=172.16.10.1 (FastEthernet0/0.10), d=172.16.10.5 (FastEthernet0/0.10), routed via RIB
*Mar 1 02:40:24.384: IP: s=172.16.10.1 (FastEthernet0/0.10), d=172.16.10.5 (FastEthernet0/0.10), len 60, rcvd 3, proto=88
*Mar 1 02:40:24.468: IP: tableid=0, s=172.16.35.3 (FastEthernet0/0.60), d=172.16.35.5 (FastEthernet0/0.10), routed via RIB
*Mar 1 02:40:24.468: IP: s=172.16.35.3 (FastEthernet0/0.60), d=172.16.35.5 (FastEthernet0/0.10), g=172.16.10.1, len 40, forward, proto=88
*Mar 1 02:40:24.488: IP: s=172.16.35.5 (local), d=224.0.0.10 (FastEthernet0/0.60), len 60, sending broad/multicast, proto=88
*Mar 1 02:40:24.488: IP: s=172.16.35.5 (local), d=172.16.35.3 (FastEthernet0/0.60), len 40, sending, proto=88
*Mar 1 02:40:24.949: IP: tableid=0, s=172.16.10.6 (FastEthernet0/0.10), d=172.16.10.5 (FastEthernet0/0.10), routed via RIB
*Mar 1 02:40:24.949: IP: s=172.16.10.6 (FastEthernet0/0.10), d=172.16.10.5 (FastEthernet0/0.10), len 60, rcvd 3, proto=88
*Mar 1 02:40:25.446: IP: s=172.16.35.3 (FastEthernet0/0.60), d=224.0.0.10, len 60, rcvd 2, proto=88
Thanks in advance
