3Com Switch 7700 Configuration Manual page 147

Setting the IS-IS to Use the MD5 Algorithm That Is Compatible With Other
Vendors' You must configure this command when the switch needs to
authenticate the devices of other vendors using MD5 algorithm in IS-IS.
Perform the following configurations in IS-IS view.
Table 68 Set IS-IS to use the MD5 Algorithm that is Compatible With Other Vendors'
Operation
Set the IS-IS to use the MD5 algorithm that is
compatible with the algorithm of another
vendor
Set the IS-IS to use the default MD5 algorithm undo md5-compatible
By default, the system uses the MD5 algorithm in IS-IS that is compatible with the
3Com algorithm.
Setting the Mesh Group of the Interface
On NBMA network, the interface of a router will flood the received LSP to other
interfaces. However, this processing method applied to a network with higher
connectivity and several p2p links will cause repeated LSP flooding and waste
bandwidth.
To avoid this problem, you can configure several interfaces into a mesh group. The
interface will flood outside the group only.
Perform the following configurations in VLAN interface view..
Table 69 Setting the Mesh Group of the Interface
Operation
Add an interface to a mesh group.
Remove the interface from the mesh group
By default, the LSP is flooded normally from the interface. When configured with
the mesh-blocked parameter, it will not flood the LSP to other interfaces.
The IS-IS configuration tasks on the interface are finished. The following sections
discuss how to configure other parameters of IS-IS.
Setting the Router Type
Users can set the level for the current router; based upon the location of the router
in the network, Level-1 (intra-domain router), Level-2 (inter-domain router) and
Level-1-2 (intra-domain router as well as inter-domain router) can be selected.
Perform the following configurations in IS-IS view..
Table 70 Setting the Router Type
Operation
Set router type
Restore the default router type
By default, the router type is level-1-2.
Command
md5-compatible
Command
isis mesh-group { mesh-group-number |
mesh-blocked }
undo isis mesh-group
Command
is-level { level-1 | level-1-2 | level-2 }
undo is-level
IS-IS 139