ISIS Adjacency

[banlan.chen]

Hi All,

What criteria should be matched each other, when two isis peers establish adjacency?

Thanks in advance

[t.baranski]

Level, hello interval, dead interval, authentication. There may be others... LAN ID perhaps?

[banlan.chen]

Thank you for your reply. But when I tried to change hello interval and dead time on one interface (isis hello-interval and isis hello-multiplier), I still could make neighborship and adjacency. From cisco's ISIS document they said the main criteria are matching authentication, IS-type and MTU size. I need to know if there are other factors. Thanks.

[vdk]

Hi,

has your problem been fixed? I have a similar one...

Vincent

[donewald]

Those three criteria are all that are needed to match, although on certain (e.g. Frame Relay) NBMA types there needs to be a mapping of CLNS to have ISIS come up. Can you describe the details of your problem? Example of your configs might help as well.

Regards,

Don

[lorcs]

Here is the other factors that must be met in order to form adjacency:

1: Length of system ID

2. Maximum number of Areas. Previously Cisco support 3 and now it can be set to 255.

3. Authentifcation.

4. Media type i.e. point-to-point or broadcast media