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BGP VPLS Auto Site ID

BGP VPLS Auto Site ID. Bhupesh Kothari (bhupesh@juniper.net) Kireeti Kompella (kireeti@juniper.net) Thomas Spencer (tsiv@att.com). VPLS Site ID Requirements. Site IDs configured on each VPLS PE must be unique per VPLS domain. Exception is multi-homing.

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BGP VPLS Auto Site ID

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  1. BGP VPLS Auto Site ID Bhupesh Kothari (bhupesh@juniper.net) Kireeti Kompella (kireeti@juniper.net) Thomas Spencer (tsiv@att.com)

  2. VPLS Site ID Requirements • Site IDs configured on each VPLS PE must be unique per VPLS domain. • Exception is multi-homing. • Site IDs must be dense per VPLS domain. • Good allocation: 10,11,12,13,50,51,52,53

  3. VPLS Auto Site ID Goals • Eliminate the need to provision site IDs • Distributed approach with no central device (like PE, RR) allocating site IDs for better scaling and fault tolerance properties • No extra state on PEs beyond what already exist today • Backwards compatibility with current explicit site ID allocation approach • Procedures should work when VPLS domain span multiple AS

  4. VPLS Auto Site ID Approach • Each PE keeps track of site IDs already in use and claims an unused ID when it needs one • If two PEs claim the same site ID, then they run a collision resolution algorithm to resolve the collision in favor of one of the claimants • Algorithm guarantees convergence: all sites will ultimately pick unique site IDs • Simple optimizations make the chance of a collision extremely small in real life • Explicitly configured site IDs always win over dynamically generated ones

  5. Auto Site ID Negotiation 1 2 Claim • Wait to receive NLRIs • Send a claim adv. • Wait for collision • No collision=>send a • real adv. • Withdraw claim adv. Real Claim 3 8 0 0 4 Real 5 0 0 8 1 8 5 1 8 E D A C 1 1 8 6 1 8 VE ID B 2 1 8 Offset Range BGP VPLS NLRI

  6. VPLS Auto Site Restrictions • Site IDs need to be explicitly configured with multi-homing • PEs cannot tell that they are connected to the same site and coordinate site ID allocation

  7. VPLS Auto Site ID • Details are in: draft-kothari-l2vpn-auto-site-id-00.txt • Questions?

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