Configuring A Mesh Group; Configuring A Designated Intermediate System; Configuring Dynamic Host Exchange; Setting The Overload Bit - Cisco Nexus 7000 Series Configuration Manual

Configuring IS-IS
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m .

Configuring a Mesh Group

You can add an interface to a mesh group to limit the amount of LSP flooding for interfaces in that mesh
group. You can optionally block all LSP flooding on an interface in a mesh group.
To add an interface to a mesh group, use the following command in interface configuration mode:
Command
isis mesh-group {blocked | mesh-id }
Example:
switch(config-if)# isis mesh-group 1

Configuring a Designated Intermediate System

You can configure a router to become the designated intermediate system (DIS) for a multiaccess
network by setting the interface priority.
To configure the DIS, use the following command in interface configuration mode:
Command
isis priority number {level-1 | level-2}
Example:
switch(config-if)# isis priority 100
level-1

Configuring Dynamic Host Exchange

You can configure IS-IS to map between the system ID and the hostname for a router using dynamic host
exchange.
To configure dynamic host exchange, use the following command in router configuration mode:
Command
hostname dynamic
Example:
switch(config-router)# hostname dynamic

Setting the Overload Bit

You can configure the router to signal other routers not to use this router as an intermediate hop in their
shortest path first (SPF) calculations. You can optionally configure the overload bit temporarily on
startup, until BGP converges.
In addition to setting the overload bit, you might also want to suppress certain types of IP prefix
advertisements from LSPs for Level 1 or Level 2 traffic.
To set the overload bit, use the following command in router configuration mode:
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
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Purpose
Adds this interface to a mesh group. The range is
from 1 to 4294967295.
Purpose
Sets the priority for DIS selection. The range is
from 0 to 127. The default is 64.
Purpose
Enables dynamic host exchange.
Chapter 9 Configuring IS-IS
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