Purge Originator Identification TLV for IS-IS

Abstract

At present, an IS-IS purge does not contain any information identifying the Intermediate System (IS) that generates the purge. This makes it difficult to locate the source IS.

IS-IS Multi-Instance

“…When an LSP purge is initiated, the IID-TLV MUST be retained, but the remainder of the body of the LSP SHOULD be removed. The purge procedure is described in [RFC6233] and [RFC6232].…”

IS-IS Registry Extension for Purges

“…An implementation MUST NOT accept a purge that contains a TLV not listed in the registry unless the purge also contains the Purge Originator Identification (POI) TLV [RFC6232]. Purges that are accepted MUST be propagated without removal of TLVs.…”