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1068 CHAPTER 74: IS-IS CONFIGURATION COMMANDS
An interface is not in any mesh group by default.
For an interface not in a mesh group, it follows the normal process to flood the
received LSPs to other interfaces. For the NBMA network with high connectivity
and multiple point-to-point links, this will cause repeated LSP flooding and
bandwidth waste.
After an interface is added to a mesh group, it will only flood a received LSP to
interfaces not belonging to the same mesh group.
When you add an interface to a mesh group or block the interface, make sure to
retain some redundancy so that a link failure will not affect the normal LSP packet
flooding.
n
■ A mesh-group is only available for a point-to-point link interface.
■ This command is not available in loopback interface view.
Examples # Add the frame relay subinterface Serial2/1.1 to the mesh-group 3.
<Sysname> system-view
[Sysname] interface serial 2/1
[Sysname-Serial2/1] link-protocol fr
[Sysname-Serial2/1] quit
[Sysname] interface serial 2/1.1
[Sysname-Serial2/1.1] isis mesh-group 3
isis peer-ip-ignore
Syntax isis peer-ip-ignore
undo isis peer-ip-ignore
View Interface view
Parameters None
Description Use the
isis peer-ip-ignore command to configure the PPP interface not to
check peer IP address upon receiving Hello packets.
Use the
undo isis peer-ip-ignore command to restore the default.
By default, the PPP interface checks the peer’s IP address upon receiving a hello
packet.
An IS-IS PPP interface requires the sender of a hello packet must be on the same
network segment with it. Otherwise, it discards the hello packet. You can use the
isis peer-ip-ignore command to disable this restriction.
Examples
■ On a router:
# Configure Serial2/0 not to check the peer’s IP address of received Hello packets.