Requirements for MEF E-Tree Support in VPLS draft-key-l2vpn-vpls-etree-reqt-02. Presenter : Manuel Paul, Deutsche Telekom IETF79, Nov 2010 Beijing, China. Authors : - Raymond Key, Telstra - Simon Delord, Telstra - Frederic Jounay, France Telecom - Lu Huang, China Mobile
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Requirements for MEF E-Tree Support in VPLSdraft-key-l2vpn-vpls-etree-reqt-02
IETF79, Nov 2010
- Raymond Key, Telstra
- Simon Delord, Telstra
- Frederic Jounay, France Telecom
- Lu Huang, China Mobile
- Zhihua Liu, China Telecom
- Manuel Paul, Deutsche Telekom
- Ruediger Kunze, Deutsche Telekom
- Nick Del Regno, Verizon
- Joshua Rogers, Time Warner Cable
Note: Simon Delord has changed affiliation to Alcatel-Lucent in Nov 2010
This is a requirement draft, not a solution draft.
The 00-version has been presented in IETF78 July 2010.
The 02-version was published in October 2010.
Lu Huang, China Mobile
Zhihua Liu, China Telecom
Manuel Paul, Deutsche Telekom
Ruediger Kunze, Deutsche Telekom
Nick Del Regno, Verizon
Joshua Rogers, Time Warner Cable
Add Section 3.4. Generic E-Tree Service
Emphasize the need to support Multiple Roots.
Emphasize the need to support all the following traffic flows
Ethernet Unicast from Root to Leaf
Ethernet Unicast from Leaf to Root
Ethernet Unicast from Root to Root
Ethernet Broadcast/Multicast from Root to Roots & Leafs
Ethernet Broadcast/Multicast from Leaf to Roots
Section 4.2. Leaf-to-Leaf Communication Restriction
Explicitly state “A problem occurs when there are two or more PEs with both Root AC and Leaf AC”
Simplify the diagram and add examples in order to explain the problem precisely
Mention possibility to get around the problem without extension to current standard VPLS but come with complexity and deployment constraints
Add Appendix A. Frequently Asked Questions
Are E-Tree requirements addressed in the VPMS requirement draft? [Short Answer: For generic E-Tree service, VPMS will not be able to meet the requirements.]
Are there any potential deployment scenarios for a “VPLS Only” solution? [Short Answer: There are potential deployment scenarios for a “VPLS Only” solution. Three examples are given.]
Some other minor wording and format changes.
Use VPLS to emulate an E-Tree service over a MPLS network
| PE1 | | PE2 |
+---+ | +---+ | | +---+ | +---+
|CE1+-----AC1----+--+ | | | | +--+----AC3-----+CE3|
+---+ (Root AC) | | V | | Ethernet | | V | | (Root AC) +---+
| | S +--+-----PW-----+--+ S | |
+---+ | | I | | | | I | | +---+
|CE2+-----AC2----+--+ | | | | +--+----AC4-----+CE4|
+---+ (Leaf AC) | +---+ | | +---+ | (Leaf AC) +---+
When PE2 receives a frame from PE1 via the Ethernet PW,
- PE2 does not know whether the ingress AC is a Leaf AC or not
- PE2 does not have sufficient information to enforce the Leaf-to-Leaf
- CE2 sends a Broadcast/Multicast frame to PE1 via AC2
- CE2 sends a Unicast frame to PE1 via AC2, destination address in
Ethernet header equal to CE4's MAC address
MUST prohibit communication between any two Leaf ACs.
MUST allow multiple Root ACs in a VPLS instance.
MUST allow Root AC and Leaf AC of a VPLS instance co-exist on any PE.
SHOULD minimise impact on existing VPLS solution.
SHOULD allow a VPLS instance composed of both PEs supporting the solution and PEs not supporting it.
More network operators have expressed their need for a VPLS-based MEF E-Tree solution.
This draft is intended to be a requirement reference for potential solutions.
We request this be adopted as a Working Group Draft.
Thank you very much.