3Com 3031 Command Reference Manual page 615

So far, a router can enable the IS-IS process on 255 interfaces at most, including
logic interfaces such as subinterfaces.
Example
Create an IS-IS routing process named "3Com", and activate this routing process
on interface serial1/0/0.
[3Com] isis 3Com
[3Com-isis] network-entity 10.0001.1010.1020.1030.00
[3Com-isis] quit
[3Com] interface serial1/0/0
[3Com-serial1/0/0] isis enable 3Com
isis mesh-group Syntax
isis mesh-group [ mesh-group-number | mesh-blocked ]
undo isis mesh-group
View
Interface view
Parameter
Description
Using the isis mesh-group command, you can add an interface to a specified
mesh group. Using the undo isis mesh-group command, you can cancel this
interface from the mesh group.
By default, the interface does not belong to any mesh group and floods LSP
normally.
The interface beyond the mesh group floods the received LSP to other interfaces,
following the normal procedure. This processing method applied to an NBMA
network with higher connectivity and several point-to-point links will cause
repeated LSP flooding and waste bandwidth.
The interface joining a mesh group only floods the received LSP to the interfaces
beyond the local mesh group.
Be sure to provide some redundancy when adding an interface to a mesh group or
blocking it, for avoiding the effect on the normal flooding of the LSP due to link
failure.
Example
Add interface serial1/0/0 to mesh group 3.
[3Com-Serial1/0/0] isis mesh-group 3
isis timer csnp Syntax
isis timer csnp seconds [ level-1 | level-2 ]
mesh-group-number: Specifies the mesh group number, ranging from 1 to
4294967295.
mesh-blocked: Blocks a specified interface, so that it will not flood the received
LSP to other interfaces.
Integrated IS-IS Configuration Commands 615