The purge-originator-identification enable command configures IS-IS to add purge-originator-identification (POI) TLV to Purge packets. If a dynamic hostname has been configured for the local device, the hostname TLV is also added to the Purge packets.
The undo purge-originator-identification enable command deletes POI TLV and hostname TLV from Purge packets.
By default, Purge packets do not carry POI TLV or hostname TLV.
purge-originator-identification enable [ always ]
undo purge-originator-identification enable [ always ]
| Parameter | Description |
|---|---|
| always | Enables IS-IS to always add the POI TLV and dynamic hostname TLV to Purge LSPs to be sent. |
Usage Scenario
When Remaining Lifetime of an LSP is 0, the LSP is invalid, and this invalid packet is a Purge packet. In most cases, a Purge packet does not carry any information about the router that generated the Purge packet. Without such information, troubleshooting is difficult if a network problem occurs.
If the purge-originator-identification enable command is run and the any authentication is configured, generated Purge LSPs do not carry the POI TLV or hostname TLV.
If the purge-originator-identification enable command is run and no authentication is configured, generated Purge LSPs will carry the POI TLV or hostname TLV.
If the purge-originator-identification enable always command is run, generated Purge LSPs carry the POI TLV and hostname TLV, regardless of whether authentication is configured.