Basic Config, Diagnosis and Troubleshoot
Diagnosis :
*Apr 14 17:19:31.600: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 100.1.2.1 (GigabitEthernet2) is down: retry limit exceeded
====>Solution: https://community.cisco.com/t5/routing/eigrp-retry-limit-exceeded/td-p/1925586
Configuration guide
ipv6 unicast-routing
!
router eigrp 100
network 100.0.0.0 0.7.255.255
eigrp router-id 2.2.2.2
!
ipv6 router eigrp 100
eigrp router-id 2.2.2.2
default-metric 1 0 1 1 1400
!
interface GigabitEthernet1
ipv6 eigrp 100
!
interface GigabitEthernet2
ipv6 eigrp 100
!
interface GigabitEthernet5
ipv6 eigrp 100
!
interface Loopback0
ipv6 eigrp 100
!
!
router eigrp 100
network 100.0.0.0 0.7.255.255
eigrp router-id 2.2.2.2
!
ipv6 router eigrp 100
eigrp router-id 2.2.2.2
default-metric 1 0 1 1 1400
!
interface GigabitEthernet1
ipv6 eigrp 100
!
interface GigabitEthernet2
ipv6 eigrp 100
!
interface GigabitEthernet5
ipv6 eigrp 100
!
interface Loopback0
ipv6 eigrp 100
!
Show commands EIGRP
check interfaces---
sh eigrp address-family ipv6 interfaces
check events and updates between neighbors---
sh eigrp address-family ipv6 events
check traffic flow between neighbors---
sh eigrp address-family ipv6 traffic
check eigrp topology / database---
sh eigrp address-family ipv6 topology
PASSIVE ==> Good
ACTIVE ===> Something is Wrong
sh eigrp address-family ipv6 interfaces
check events and updates between neighbors---
sh eigrp address-family ipv6 events
check traffic flow between neighbors---
sh eigrp address-family ipv6 traffic
check eigrp topology / database---
sh eigrp address-family ipv6 topology
PASSIVE ==> Good
ACTIVE ===> Something is Wrong
Diagnosis and Tshoot
R2#sh eigrp address-family ipv4 events | s 100.0.0.3
32 18:19:25.197 Metric set: 100.0.0.3/32 metric(130816)
34 18:19:25.197 Update sent, RD: 100.0.0.3/32 metric(Infinity)
36 18:19:25.197 Update sent, RD: 100.0.0.3/32 metric(Infinity)
37 18:19:25.197 Route installed: 100.0.0.3/32 100.2.3.3
38 18:19:25.197 Route installing: 100.0.0.3/32 100.2.3.3
39 18:19:25.197 Find FS: 100.0.0.3/32 metric(Infinity)
41 18:19:25.197 Rcv update dest/nh: 100.0.0.3/32 100.2.3.3
42 18:19:25.197 Metric set: 100.0.0.3/32 metric(Infinity)
32 18:19:25.197 Metric set: 100.0.0.3/32 metric(130816)
34 18:19:25.197 Update sent, RD: 100.0.0.3/32 metric(Infinity)
36 18:19:25.197 Update sent, RD: 100.0.0.3/32 metric(Infinity)
37 18:19:25.197 Route installed: 100.0.0.3/32 100.2.3.3
38 18:19:25.197 Route installing: 100.0.0.3/32 100.2.3.3
39 18:19:25.197 Find FS: 100.0.0.3/32 metric(Infinity)
41 18:19:25.197 Rcv update dest/nh: 100.0.0.3/32 100.2.3.3
42 18:19:25.197 Metric set: 100.0.0.3/32 metric(Infinity)
R2#sh eigrp address-family ipv4 interfaces
EIGRP-IPv4 Interfaces for AS(100)
Xmit Queue PeerQ Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable Un/Reliable SRTT Un/Reliable Flow Timer Routes
Gi1 1 0/0 0/0 7 0/0 50 0
Gi2 0 0/0 0/0 0 0/0 0 0
Gi4 0 0/0 0/0 0 0/0 0 0
Gi5 0 0/0 0/0 0 0/0 0 0
Lo0 0 0/0 0/0 0 0/0 0 0
R2#
R2#sh eigrp address-family ipv4 traffic
EIGRP-IPv4 Traffic Statistics for AS(100)
Hellos sent/received: 594/150
Updates sent/received: 5/4
Queries sent/received: 0/0
Replies sent/received: 0/0
Acks sent/received: 2/4
SIA-Queries sent/received: 0/0
SIA-Replies sent/received: 0/0
Hello Process ID: 586
PDM Process ID: 585
Socket Queue: 0/10000/2/0 (current/max/highest/drops)
Input Queue: 0/10000/2/0 (current/max/highest/drops)
R2#
EIGRP-IPv4 Traffic Statistics for AS(100)
Hellos sent/received: 594/150
Updates sent/received: 5/4
Queries sent/received: 0/0
Replies sent/received: 0/0
Acks sent/received: 2/4
SIA-Queries sent/received: 0/0
SIA-Replies sent/received: 0/0
Hello Process ID: 586
PDM Process ID: 585
Socket Queue: 0/10000/2/0 (current/max/highest/drops)
Input Queue: 0/10000/2/0 (current/max/highest/drops)
R2#
R2#sh eigrp address-family ipv4 topology 100.0.0.3/32
EIGRP-IPv4 Topology Entry for AS(100)/ID(2.2.2.2) for 100.0.0.3/32
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 130816
Descriptor Blocks:
100.2.3.3 (GigabitEthernet1), from 100.2.3.3, Send flag is 0x0
Composite metric is (130816/128256), route is Internal
Vector metric:
Minimum bandwidth is 1000000 Kbit
Total delay is 5010 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 1
Originating router is 3.3.3.3
R2#
EIGRP-IPv4 Topology Entry for AS(100)/ID(2.2.2.2) for 100.0.0.3/32
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 130816
Descriptor Blocks:
100.2.3.3 (GigabitEthernet1), from 100.2.3.3, Send flag is 0x0
Composite metric is (130816/128256), route is Internal
Vector metric:
Minimum bandwidth is 1000000 Kbit
Total delay is 5010 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 1
Originating router is 3.3.3.3
R2#
R2#sh ipv6 protocols | b EIGRP
EIGRP-IPv6 Protocol for AS(100)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
Soft SIA disabled
NSF-aware route hold timer is 240
EIGRP NSF disabled
NSF signal timer is 20s
NSF converge timer is 120s
Router-ID: 2.2.2.2
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 16
Maximum hopcount 100
Maximum metric variance 1
Default redistribution metric is 1 0 1 1 1400
Interfaces:
GigabitEthernet1
GigabitEthernet2
GigabitEthernet5
Redistribution:
None
EIGRP-IPv6 Protocol for AS(100)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
Soft SIA disabled
NSF-aware route hold timer is 240
EIGRP NSF disabled
NSF signal timer is 20s
NSF converge timer is 120s
Router-ID: 2.2.2.2
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 16
Maximum hopcount 100
Maximum metric variance 1
Default redistribution metric is 1 0 1 1 1400
Interfaces:
GigabitEthernet1
GigabitEthernet2
GigabitEthernet5
Redistribution:
None
R2#sh ip protocols | b EIGRP
EIGRP-IPv4 Protocol for AS(100)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
Soft SIA disabled
NSF-aware route hold timer is 240
EIGRP NSF disabled
NSF signal timer is 20s
NSF converge timer is 120s
Router-ID: 2.2.2.2
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1
Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:
100.0.0.0/13
Routing Information Sources:
Gateway Distance Last Update
100.2.3.3 90 00:19:40
EIGRP-IPv4 Protocol for AS(100)
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
Soft SIA disabled
NSF-aware route hold timer is 240
EIGRP NSF disabled
NSF signal timer is 20s
NSF converge timer is 120s
Router-ID: 2.2.2.2
Topology : 0 (base)
Active Timer: 3 min
Distance: internal 90 external 170
Maximum path: 4
Maximum hopcount 100
Maximum metric variance 1
Automatic Summarization: disabled
Maximum path: 4
Routing for Networks:
100.0.0.0/13
Routing Information Sources:
Gateway Distance Last Update
100.2.3.3 90 00:19:40