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9-16
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
OL-20002-02
Chapter 9 Configuring IS-IS
Configuring IS-IS
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:
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:
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:
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:
Command Purpose
isis mesh-group {blocked |
mesh-id
}
Example:
switch(config-if)# isis mesh-group 1
Adds this interface to a mesh group. The range is
from 1 to 4294967295.
Command Purpose
isis priority
number
{level-1 | level-2}
Example:
switch(config-if)# isis priority 100
level-1
Sets the priority for DIS selection. The range is
from 0 to 127. The default is 64.
Command Purpose
hostname dynamic
Example:
switch(config-router)# hostname dynamic
Enables dynamic host exchange.
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