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MAC Address Withdrawal Mechanism for Static Pseudowires in MPLS Networks

This document outlines the MAC address withdrawal mechanism over static pseudowires (PW) as defined in draft-ietf-pwe3-static-pw-status-01.txt. It highlights the importance of acknowledging Operations, Administration, and Maintenance (OAM) messages, and establishes that MAC withdraw notifications are not refreshed indefinitely. The mechanism includes the identification of duplicate messages using sequence numbers to prevent unnecessary flushing of MAC addresses. Key operational details and message structures for MAC withdraw OAM messages are presented to ensure efficient network management.

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MAC Address Withdrawal Mechanism for Static Pseudowires in MPLS Networks

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  1. MAC Address Withdrawal Over Static PWdraft-boutros-pwe3-mpls-tp-mac-wd-00.txt Sami Boutros Siva Sivabalan Luca Martini

  2. Background • MAC withdraw mechanism over static PW: • Based on PW OAM message defined in “draft-ietf-pwe3-static-pw-status-01.txt” • A given MAC withdraw notification is not refreshed for ever • Acknowledgment of OAM messages is mandatory • Duplicate messages are identified using sequence number in order to avoid repeated (unnecessary) flushing of MAC address(es)

  3. MAC Withdraw OAM Message 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 0 0 0 1 |Version| Reserved | 0xZZ PW OAM Message | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ACH TLV Header | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Refresh Timer | TLV Length |A| Flags | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|0 | Sequence Number TLV | TLV Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Sequence Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | MAC List TLV | ~ PE-ID TLV (optional) ~ | MAC Flush Parameter TLV (optional) | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  4. MAC Withdraw OAM Message (cont’d) • Refresh Timer field is not used • Message without Sequence Number TLV is dropped • ACK message (A bit set) does not include MAC TLVs

  5. Operation • A sender re-transmits a MAC withdraw message with a given sequence number if it does not receive ACK for that sequence number • A receiver always acknowledges any incoming MAC withdraw message (new or duplicate) • A receiver processes a MAC withdraw message only if the sequence number of that message is greater than that of the last processed MAC withdraw message

  6. Thank You !

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