cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements

519
Views
0
Helpful
5
Replies
Highlighted
Beginner

EIGRP Flap on DS3 link , no drop on WAN

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.

Everyone's tags (6)
1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

EIGRP Flap on DS3 link , no drop on WAN

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.

View solution in original post

5 REPLIES 5
Cisco Employee

EIGRP Flap on DS3 link , no drop on WAN

Hi

Can you paste the logs you are getting

and paste the ping results

Beginner

EIGRP Flap on DS3 link , no drop on WAN

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.

Cisco Employee

EIGRP Flap on DS3 link , no drop on WAN

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.

View solution in original post

Cisco Employee

EIGRP Flap on DS3 link , no drop on WAN

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

Beginner

EIGRP Flap on DS3 link , no drop on WAN

Hi Subramaniya/Raj,

After changing the MTU on tunnel interface , this issue got resolved.

Thanks For your help

CreatePlease to create content
Content for Community-Ad
August's Community Spotlight Awards