Brocade BigIron RX Series Configuration Guide - Manual (Page 1031)

BigIron RX Series Configuration Guide 953
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Globally configuring IS-IS on a device
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• If an IS is in the overload state for Level-1, other Level-1 ISs stop using the overloaded IS to
forward Level-1 traffic. However, the IS can still forward Level-2 traffic, if applicable.
• If an IS is in the overload state for Level-2, other Level-2 ISs stop using the overloaded IS to
forward Level-2 traffic. However, the IS can still forward Level-1 traffic, if applicable.
• If an IS is in the overload state for both levels, the IS cannot forward traffic at either level.
By default, the device automatically sets the overload bit to 1 (on) in its LSPDUs to other ISs if an
overload condition occurs.
You can set the overload bit on to administratively shut down IS-IS without disabling the protocol.
Setting the overload bit on is useful when you want to make configuration changes without
removing the device from the network.
In addition, you can configure the device to set the overload bit on for a specific number of seconds
during startup, to allow IS-IS to become fully active before the device begins IS-IS routing. By
default, there is no delay (0 seconds).
To immediately set the overload bit on, enter the following command.
BigIron RX(config-isis-router)# set-overload-bit
This command administratively shuts down IS-IS by configuring the device to immediately set the
overload bit to 1 (on) in all LSPs sent to other ISs.
To configure the device to temporarily set the overload bit on after a software reload, enter a
command such as the following.
BigIron RX(config-isis-router)# set-overload-bit on-startup 5
This command configures the device to set the overload bit on in all its IS-IS LSPs sent to other ISs
during the first five seconds following a successful software reload. After the five seconds expire,
the device resets the overload bit to off in all its IS-IS LSPs.
Syntax: [no] set-overload-bit [on-startup <secs>]
The on-startup <secs> parameter specifies the number of seconds following a reload to set the
overload bit on. You can specify 0 or a number from 5 – 86400 (24 hours). The default is 0, which
means the device starts performing IS-IS routing immediately following a successful software
reload.
Configuring authentication
By default, the BigIron RX does not authenticate packets sent to or received from ESs or other ISs.
You can configure the following types of passwords for IS-IS globally.
TABLE 146 IS-IS passwords
Password type Scope Where used Default
Domain Level-2 Level-2 LSPDU None configured
Area Level-1 Level-1 LSPDU None configured
Interface Level-1 and Level-2 Hello PDU None configured