RTO 5000 in Eigrp

[Anuj Singhi]

Hi,

I am running a direct link between two locations and eigrp is running over it, but its flapping a lot. Below is the configuration

S1#sh run int vl87

Building configuration...

Current configuration : 179 bytes

!

interface Vlan87

mtu 1536

ip address 143.97.16.109 255.255.255.252

ip authentication mode eigrp 224 md5

ip authentication key-chain eigrp 224 statoil-internal

mpls ip

end

S1#sh run int te3/6

Building configuration...

Current configuration : 132 bytes

!

interface TenGigabitEthernet3/6

switchport

switchport access vlan 87

switchport mode access

mtu 9216

mls qos trust dscp

end

At switch 2 the configuration is

S2#sh run int vl87

Building configuration...

Current configuration : 179 bytes

!

interface Vlan87

mtu 1536

ip address 143.97.16.110 255.255.255.252

ip authentication mode eigrp 224 md5

ip authentication key-chain eigrp 224 statoil-internal

mpls ip

end

S2#sh run int te2/3/7

Building configuration...

Current configuration : 134 bytes

!

interface TenGigabitEthernet2/3/7

switchport

switchport access vlan 87

switchport mode access

mtu 9216

mls qos trust dscp

end

The eigrp is flapping a lot and I am getting RTO s 5000

EIGRP-IPv4 Neighbors for AS(224)

H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq

                                            (sec)         (ms)       Cnt Num

0   143.97.16.110           Vl87              12 00:00:11    1  5000  1  0

Please help me.

[Vasilii Mikhailovskii]

Hello, Anuj.

Try to troubleshoot your link for packet loss.

Wheneven you see Q count not equal to 0 ("1" in your case) - it's not a flap - it's one-way traffic flow.

So, if up-time is about 10+ seconds and Q!=0, then - S1 receives EIGRP traffic, but S2 does not.

PS: check your log for details; please provide "sh int te..."

[Anuj Singhi]

I ran debug eigrp and toggle the neighbourship which resolved the issue. Thanks