Riverstone Networks WICT1-12 - Manual (Page 237)

Riverstone Networks RS Switch Router User Guide Release 8.0 15-3
IS-IS Configuration Guide Setting IS-IS Global Parameters
To set the time interval between PSNP transmissions, enter the following command in Configure mode:
15.4.3 Setting the System ID
A system ID is a unique 12 hexadecimal number that uniquely identifies the IS in the routing domain. A system ID is
assigned to the IS by default, but can be overwritten using the following command.
To set the system ID for an IS, enter the following command in Configure mode:
Note that once the system ID is set, it cannot be changed without disabling and reenabling IS-IS.
15.4.4 Setting the SPF Interval
The spf interval is the time period between route table recalculations. The default is 2 seconds. Increasing the spf
interval allows time for more changes to occur before the recalculation.
To set a router’s spf interval, enter the following command in Configure mode:
15.4.5 Setting the Overload Bit
The IS-IS protocol provides a feature for routers to signal each other when they cannot record the complete LSP
database. (This occurs when a router has run out of memory.) When a router experiences memory overload, it sets its
overload bit in its LSPs. The other routers will then route packets to that router’s directly connected networks, but will
not use it to route transit traffic until its overload bit is cleared. In the RS, you can manually set the router’s overload
bit so it functions only as an end system.
To set the router’s overload bit, enter the following command in Configure mode:
Sets the PSNP interval.
isis set psn-interval
<number>
Sets the system ID for a router.
isis set system-id
<string>
Sets the router’s spf interval.
isis set spf-interval
<number>
Sets the overload bit. isis set overload-bit