10-07-2012 08:24 PM - edited 03-04-2019 05:47 PM
Hi,
I have configured new DS3 link as below.Also GRE tunnel build on it.EIGRP running between tunnel interfaces.
EIGRP is flapping every minute , i dont found any packet drop between 2 routers WAN interfaces, but ping stcuks for some time.
During this time EIGRP flaps.ISP dont found any issue in network.
int s4/0
ip add x.x.x.x
encapsulation ppp
dsu bandwidth 44210
scramble
crc 32
serial restart-delay 0
interface Tunnel155
bandwidth 25000
ip address A.B.C.D
no ip redirects
no ip proxy-arp
ip tcp adjust-mss 1432
load-interval 30
delay 100
qos pre-classify
keepalive 10 3
tunnel source Serial4/0
tunnel destination YY.Y.Y.
Solved! Go to Solution.
10-07-2012 09:24 PM
Did you check the IP MTU on both sides of the tunnel? You might want to reduce the MTU size according to how much your physical link supports.
10-07-2012 09:15 PM
Hi
Can you paste the logs you are getting
and paste the ping results
10-07-2012 09:21 PM
HI,
Logs are as below.
%DUAL-5-NBRCHANGE: EIGRP-IPv4 888: Neighbor X.X.X.X (Tunnel155) is down: retry limit exceeded
%DUAL-5-NBRCHANGE: EIGRP-IPv4 888: Neighbor X.X.X.X (Tunnel155) is up: new adjacency
Ping response dont have any drop , but when ping observed closely , ping stucks at some point & eigrp flaps at that point.ping completes without drop.
10-07-2012 09:24 PM
Did you check the IP MTU on both sides of the tunnel? You might want to reduce the MTU size according to how much your physical link supports.
10-07-2012 09:36 PM
What is the logs on other end
and interface configs
check the ping with the configured MTU with df-bit set and see if you are seeing any drops
10-08-2012 09:16 PM
Hi Subramaniya/Raj,
After changing the MTU on tunnel interface , this issue got resolved.
Thanks For your help
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