Huawei S6700 Series Configuration Manual page 277

S6700 Series Ethernet Switches
Configuration Guide - IP Routing
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Issue 01 (2012-03-15)
The system view is displayed.
2. Run:
isis [ process-id ]
The IS-IS view is displayed.
3. Run:
lsp-length originate max-size
The size of an LSP generated by the system is set.
4. Run:
lsp-length receive max-size
The size of a received LSP is set.
NOTE
When using max-size, ensure that the value of the max-size of the generated LSP packet (or the
forwarded LSP packet) must be smaller than or equal to that of the received LSP packet.
The value of max-size set by using the lsp-length command must meet the following
conditions.
– 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.
Adding an Interface to a Mesh Group
1. Run:
system-view
The system view is displayed.
2. Run:
interface vlanif vlan-id
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 switch 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 switch 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.
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