User guide

Configuring IS-IS Configuring IS-IS
page 3-30 OmniSwitch AOS Release 7 Advanced Routing Configuration Guide March 2015
Configuring Router Capabilities
The following table lists various commands that can be useful in tailoring a router’s performance
capabilities. All the listed parameters have defaults that are acceptable for running an IS-IS network.
To set the IS-IS router to operate in overload state, enter:
-> ip isis overload timeout 70
To configure the router to be in the overload state, enter:
-> ip isis overload-on-boot timeout 80
To enable the adjacency check configuration, enter:
-> ip isis strict-adjacency-check enable
Configuring Redundant Switches in a Stack for Graceful Restart
By default, IS-IS graceful restart is disabled. When graceful restart is enabled, the router can either be a
helper or a restarting router. When graceful restart is enabled on the router, the helper mode is
automatically enabled by default. To configure IS-IS graceful restart support on OmniSwitch switches, use
the ip isis graceful-restart command.
For example, to configure graceful restart on the router, enter:
-> ip isis graceful-restart
The helper mode can be disabled on the router with the ip isis graceful-restart helper command. For
example, to disable the helper support for neighboring routers, enter the following:
-> ip isis graceful-restart helper disable
To disable support for graceful restart, use the no form of the ip isis graceful-restart command by
entering:
-> no ip isis graceful-restart
Continuous forwarding during a graceful restart depends on several factors. If the secondary module has a
different router MAC than the primary module, or if one or more ports of a VLAN belonged to the
primary module, spanning tree re-convergence might disrupt forwarding state, even though IS-IS performs
a graceful restart.
ip isis overload Sets the IS-IS router to operate in the overload state.
ip isis overload-on-boot Configures the router to be in the overload state.
ip isis strict-adjacency-check Enables or disables the adjacency check configuration.
Note. In the current release, only the graceful restart helper mode is supported.
Note. Graceful restart is only supported on active ports (i.e., interfaces), which are on the secondary or idle
switches in a stack during a takeover. It is not supported on ports on a primary switch in a stack.