Huawei Quidway NetEngine80E Configuration Manual page 547

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
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Issue 02 (2014-09-30)
– The MTU value of an Ethernet interface must be greater than or equal to the sum of
max-size and 3.
– The MTU value of a P2P interface must be greater than or equal to the value of max-
size.
Add an interface to a mesh group
1. Run:
system-view
The system view is displayed.
2. Run:
interface interface-type interface-number
The VLANIF interface view is displayed.
3. Run:
isis mesh-group { mesh-group-number | mesh-blocked }
The interface is added to a mesh group.
On the Non Broadcast Multiple Access (NBMA) network, after receiving an LSP, the
interface of a router floods the LSP to the other interfaces. In a network with higher
connectivity and multiple P2P links, however, the flooding method causes repeated LSP
flooding and wastes bandwidth.
To avoid the preceding problem, you can configure several interfaces to form a mesh group.
The router in the mesh group does not flood the LSP received from an interface of the group
to the other interfaces of the group, but floods it to interfaces of other groups or interfaces
that do not belong to any group.
When mesh-blocked is configured on an interface, the interface is blocked and cannot
flood LSPs outside. All the interfaces added to a mesh group implement global LSDB
synchronization through CSNP and PSNP mechanisms.
NOTE
In an ATM or FR network, IS-IS routers are connected through Virtual Circuits (VCs), and the
interface here is the logical P2P sub-interface.
Configure LSP fragments extension
1. Run:
system-view
The system view is displayed.
2. Run:
isis [ process-id ]
The IS-IS view is displayed.
3. Run:
lsp-fragments-extend
mode-2 ] ] *
LSP fragments extension is enabled in an IS-IS process.
4. Run:
virtual-system virtual-system-id
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7 IS-IS Configuration
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