EIGRP FLAP due to Exceeded Retry Limit

[telus]

Hi All ,

I am facing EIGRP flapping issue , refer below logs :

Please suggest what could be the issue :

R01 logs

======================================================================

.Aug 22 06:05:45.125: %DUAL-5-NBRCHANGE: EIGRP-IPv4 107: Neighbor 192.168.128.81 (GigabitEthernet0/0) is up: new adjacency
.Aug 22 06:06:39.996: %DUAL-5-NBRCHANGE: EIGRP-IPv4 107: Neighbor 192.168.128.81 (GigabitEthernet0/0) is down: Interface PEER-TERMINATION received
.Aug 22 06:06:44.460: %DUAL-5-NBRCHANGE: EIGRP-IPv4 107: Neighbor 192.168.128.81 (GigabitEthernet0/0) is up: new adjacency
.Aug 22 06:07:39.331: %DUAL-5-NBRCHANGE: EIGRP-IPv4 107: Neighbor 192.168.128.81 (GigabitEthernet0/0) is down: Interface PEER-TERMINATION received
.Aug 22 06:07:40.463: %DUAL-5-NBRCHANGE: EIGRP-IPv4 107: Neighbor 192.168.128.81 (GigabitEthernet0/0) is up: new adjacency
.Aug 22 06:08:35.335: %DUAL-5-NBRCHANGE: EIGRP-IPv4 107: Neighbor 192.168.128.81 (GigabitEthernet0/0) is down: Interface PEER-TERMINATION received
.Aug 22 06:08:35.627: %DUAL-5-NBRCHANGE: EIGRP-IPv4 107: Neighbor 192.168.128.81 (GigabitEthernet0/0) is up: new adjacency

show ip eigrp interfaces detail gigabitEthernet 0/0
EIGRP-IPv4 Interfaces for AS(107)
                        Xmit Queue   Mean   Pacing Time   Multicast    Pending
Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
Gi0/0              1        0/0         7       0/4           50           0
  Hello-interval is 5, Hold-time is 15
  Split-horizon is enabled
  Next xmit serial <none>
  Un/reliable mcasts: 0/0  Un/reliable ucasts: 1926919/1970658
  Mcast exceptions: 0  CR packets: 0  ACKs suppressed: 21994
  Retransmissions sent: 43701  Out-of-sequence rcvd: 3232
  Topology-ids on interface - 0
  Authentication mode is not set

R02 :

465957: .Aug 22 00:49:07 UTC-4: %DUAL-5-NBRCHANGE: EIGRP-IPv4(11) 107: Neighbor 192.168.128.82 (GigabitEthernet7/0/1.205) is up: new adjacency
465962: .Aug 22 00:50:02 UTC-4: %DUAL-5-NBRCHANGE: EIGRP-IPv4(11) 107: Neighbor 192.168.128.82 (GigabitEthernet7/0/1.205) is down: retry limit exceeded
465963: .Aug 22 00:50:02 UTC-4: %DUAL-5-NBRCHANGE: EIGRP-IPv4(11) 107: Neighbor 192.168.128.82 (GigabitEthernet7/0/1.205) is up: new adjacency
465966: .Aug 22 00:50:57 UTC-4: %DUAL-5-NBRCHANGE: EIGRP-IPv4(11) 107: Neighbor 192.168.128.82 (GigabitEthernet7/0/1.205) is down: retry limit exceeded

H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq
                                            (sec)         (ms)       Cnt Num
5   192.168.128.82          Gi7/0/1.205       14 00:00:00    4   450  1  3476662  <<<<<<<<<<<<<< Q count =1

[balaji.bandi]

Look at the R1 and R2 connectivity and configuration how they connected.

R1  - i see connected to GigabitEthernet0/0

R2 - it was subinterface (GigabitEthernet7/0/1.205)  - how is these connected to R1 ?

Verify the connectivity and config of both the devices  and some observation to Hello Interval(timer) values of both neighbors 

- or  post full config of both and explain how are they connected ?

# show ip eigrp X interfaces detail GigabitEthernet7/0/1.205

[telus]

Hi Balaji,

Hello , hold down timer , MTU are by default set .

Not sure if any customer owned devices since we traceout to otherend in next hop .

R01#show run int GigabitEthernet0/0
Building configuration...

Current configuration : 268 bytes
!
interface GigabitEthernet0/0
 bandwidth 5120
 ip address 192.168.128.82 255.255.255.252
 ip load-sharing per-packet
 delay 10
 duplex full
 speed 100
 no cdp enable
end

R01#traceroute 192.168.128.81

Type escape sequence to abort.
Tracing the route to 192.168.128.81

  1 192.168.128.81 4 msec *  4 msec

R01#show ip route 192.168.128.81
Routing entry for 192.168.128.80/30
  Known via "connected", distance 0, metric 0 (connected, via interface)
  Redistributing via ospf 1, eigrp 107
  Advertised by ospf 1 subnets
  Routing Descriptor Blocks:
  * directly connected, via GigabitEthernet0/0
      Route metric is 0, traffic share count is 1

router eigrp 107
 network 10.200.2.0 0.0.0.3
 network 10.200.50.0 0.0.0.255
 network 10.200.75.0 0.0.0.255
 network 10.200.100.0 0.0.0.255
 network 10.200.110.0 0.0.0.255
 network 10.234.94.0 0.0.0.255
 network 10.234.95.0 0.0.0.255
 network 10.234.96.0 0.0.0.255
 network 10.234.97.0 0.0.0.255
 network 10.234.106.0 0.0.0.255
 network 10.234.107.0 0.0.0.255
 network 10.234.108.0 0.0.0.255
 network 192.168.128.80 0.0.0.3
 network 201.220.57.240 0.0.0.0
 neighbor 192.168.128.81 GigabitEthernet0/0
 passive-interface default
 no passive-interface GigabitEthernet0/0

R02#show run int Gi7/0/1.205
Building configuration...

Current configuration : 302 bytes
!
interface GigabitEthernet7/0/1.205
 bandwidth 5120
 encapsulation dot1Q 205
 ip vrf forwarding abc
 ip address 192.168.128.81 255.255.255.252
 delay 100
end

EIGRP config on R02 :

-------------------

router eigrp 1
 no auto-summary

address-family ipv4 vrf ambev
  autonomous-system 107
  network 192.168.128.80 0.0.0.3
  neighbor 192.168.128.82 GigabitEthernet7/0/1.205
  no auto-summary
 exit-address-family