MAC Address Withdrawal Over Static PW
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MAC Address Withdrawal Over Static PW draft-boutros-pwe3-mpls-tp-mac-wd-01.txt Sami Boutros Siva Sivabalan Luca Martini. Background. MAC withdraw mechanism over static PW: Based on PW OAM message defined in “draft-ietf-pwe3-static-pw-status-01.txt”

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Background

MAC Address Withdrawal Over Static PWdraft-boutros-pwe3-mpls-tp-mac-wd-01.txt Sami Boutros Siva Sivabalan Luca Martini


Background

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)


Background

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) |

| |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


Background

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


Background

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


Background

Thank You !


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