clns mtu mismatch. ISIS adjacency is up.

[sachin30720041]

Hi All,

ISIS is running on R1 and R2.

R1(gig0/0)-----(gig0/0)R2.

on R1:

interface GigabitEthernet0/0
mtu 2000
ip address 100.10.20.1 255.255.255.0
ip router isis 1
duplex auto
speed auto
media-type rj45
clns mtu 1800

on R2:-

interface GigabitEthernet0/0
mtu 2100
ip address 100.10.20.2 255.255.255.0
ip router isis 1
duplex auto
speed auto
media-type rj45
clns mtu 1900

On R1, CLNS MTU is 1800 and on R2, CLNS MTU is 1900.

But still, the isis adjacency is up. I am expecting adj to be in INIT or Down state.

If there is an MTU mismatch then clns adjacnecy should not be up. Right?

Thanks,

Sachin

[Georg Pauwen]

Hello,

check if hello padding is turned on by any chance.

If so, turn it off:

no hello padding

[balaji.bandi]

Can you post the below output :

# show clns neighbors
#show interface GigabitEthernet0/0  ( from both the routers)