866 BigIron RX Series Configuration Guide53-1001986-01Globally configuring IS-IS on a device28Changing the IS-IS Level globallyBy default, a BigIron RX can operate as both a Level-1 and IS-IS Level-2 router. To globally changethe level supported from Level-1 and Level-2 to Level-1 only, enter the following command.BigIron RX(config-isis-router)# is-type level-1Syntax: [no] is-type level-1 | level-1-2 | level-2The level-1 | level-1-2 | level-2 parameter specifies the IS-IS type. If you want to re-enable supportfor both IS-IS types, re-enter the command you entered to change the IS-IS type, and use “no” infront of the command.To change the IS-IS on an interface, refer to “Changing the IS-IS level on an interface” on page 878.Disabling or re-enabling display of hostnameBrocade’s implementation of IS-IS supports RFC 2763, which describes a mechanism for mappingIS-IS system IDs to the hostnames of the devices with those IDs. For example, if you set thehostname on the device to “IS-IS Router 1”, the mapping feature uses this name instead of thedevice’s IS-IS system ID in the output of the following commands.• show isis database• show isis interface• show isis neighborThe device’s hostname is displayed in each CLI command prompt, for example.BigIron RX(config-isis-router)#The name mapping feature is enabled by default. If you want to disable name mapping, enter thefollowing command.BigIron RX(config-isis-router)# no hostname.Syntax: [no] hostnameTo display the name mappings, enter the show isis hostname command.Changing the sequence numbers PDU intervalA Complete Sequence Numbers PDU (CSNP) is a complete list of the LSPs in the Designated IS’ linkstate database. The CSNP contains a list of all the LSPs in the database, as well as otherinformation that helps IS neighbors determine whether their LSP databases are in sync with oneanother. The Designated IS sends CSNPs to the broadcast interface. Level-1 and Level-2 each havetheir own Designated IS.A Partial Sequence Numbers PDU (PSNP) is a partial list of LSPs. ISs other than the Designated IS(that is, the non-Designated ISs) send PSNPs to the broadcast interface.The CSNP interval specifies how often the Designated IS sends a CSNP to the broadcast interface.Likewise, the PSNP interval specifies how often other ISs (non-Designated ISs) send a PSNP to thebroadcast interface.The interval you can configure on the device applies to both Level-1 and Level-2 CSNPs and PSNPs.The default interval is 10 seconds. You can set the interval to a value from 0 – 65535 seconds.To change the interval, enter a command such as the following.
