configure isis mesh

configure isis [vlan all | {vlan} vlan_name] mesh [block-none | block-all | block-group group_id]

Description

This command configures LSP flooding behavior for the specified interface.

Syntax Description

vlan all

Applies the configuration to all IS-IS VLANs.

vlan_name

Specifies a single VLAN to which the configuration applies.

block-none

Disables LSP blocking.

block-all

Blocks all LSPs. No LSPs are flooded out of the selected interface.

block-group

Blocks LSPs that contain the specified group ID.

group_id

Specifies a group ID number. The range is 1 to 4294967295.

Default

Block-none.

Usage Guidelines

In a mesh environment, which is a set of fully interconnected point-to-point interfaces, LSP flooding can generate N2 PDUs because no router can tell which routers have and have not received the flooded LSP. By carefully selecting the links over which LSPs are flooded, traffic can be greatly reduced at the cost of some resiliency. Using mesh group IDs instead of a full block (the block-all option) allows a finer granularity of control.

Example

The following command configures blocking on SJvlan for group 5:

configure isis SJvlan mesh block-group 5

History

This command was first available in ExtremeXOS 12.1.

Platform Availability

This command is available on platforms with a Core license.