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David Allan (ed) Peter Ashwood-Smith Nigel Bragg (ed) Don Fedyk Paul Unbehagen]

IS-IS Extensions Supporting IEEE 802.1aq Shortest Path Bridging http://www.ietf.org/internet-drafts/draft-ietf-isis-ieee-aq-00.txt. David Allan (ed) Peter Ashwood-Smith Nigel Bragg (ed) Don Fedyk Paul Unbehagen] IETF 78 Maastricht / July 2010. Provider. Backbone. Bridges. 802.1ah.

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David Allan (ed) Peter Ashwood-Smith Nigel Bragg (ed) Don Fedyk Paul Unbehagen]

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  1. IS-IS Extensions Supporting IEEE 802.1aq Shortest Path Bridginghttp://www.ietf.org/internet-drafts/draft-ietf-isis-ieee-aq-00.txt David Allan (ed) Peter Ashwood-Smith Nigel Bragg (ed) Don Fedyk Paul Unbehagen] IETF 78 Maastricht / July 2010

  2. Provider Backbone Bridges 802.1ah Provider Bridges 802.1ad Ethernet Ethertype VLAN C-VID C-TAG Ethernet 802.3 S-VID S-TAG SA DA Ethertype C-VID I-SID Ethertype C-TAG I-TAG C-VID S-VID B-VID Ethertype Q-TAG S-TAG B-TAG SA SA SA B-SA DA DA DA B-DA 1998 2005 2008 IEEE 802.1 wishes to provide SPF/L2VPN routing to existing Ethernet ASIC based data paths Macin Mac Q in Q FORWARDING ONTHESE FIELDSONLY BECAUSE …. USING THESE DATAPATHS

  3. They are routed with distance vector style protocol(s) (*)STP that create trees .. not ideal at larger scales because… 2 – long wayfrom shortest paths.. 1- Can’t use these links SOURCE A1.. A100 ROOT DEST 3 - LEARN A1..A100on tree..

  4. We wish to achieve this….. All links usable Shortest Paths Equal Cost x N Animation Courtesy of Guoli Yin AND …

  5. Support logical connectivity (L2VPN) An L2VPN (E-LAN) with 7 members Want to have single point membership provisioning. Want automatic unicast and multicast forwarding. Want existing Ethernet OA&M to work unchanged. This causes requirements for symmetric and congruent unicast/multicast. Animation Courtesy of Guoli Yin

  6. The set of all pruned SPF trees for a given VPN is referred to as an “active topology” for that VPN service. Active topology for VPN instance 256 with 8 members.

  7. IS-IS is the logical choice • Topology discovery • Each bridge is aware of the physical topology • We add a new link metric just for SPB. • Service discovery • VPN membership is included “ISID”. • Calculations produce FIB: [DA, VID] => NextHop(s) • 16 different variations (ECT-ALGORITHMs) • produces different Equal cost behaviors isolate by VID.

  8. 802.1aq ISIS LSP extensions at a glance LSPID Seq Num Checksum …. ---------------------------------------------- 4455.6677.0001.00-00 0x0000007a 0xc01f ….. SOURCE 4455.6677.0001.00 HOST NAME Instance_1 NLPID SPB (0xC1) AREA ADDR 22.3344 NBR ID 4455.6677.0004.00 COST: 10 NBR ID 4455.6677.0003.00 COST: 10 SPSOURCEID 07-00-01 SPB ECT-ALGORITHM 1 ECT-VID 101 SPB ECT-ALGORITHM 0 ECT-VID 100 SPB BMAC 44-55-66-77-00-01 ECT-VID 100 SPB ISID 255T&R SPB BMAC 44-55-66-77-00-01 ECT-VID 101 SPB ISID 256T&R (1) :4 10 (2) 255 (3) :1 :3 10 256 (4) LSP fragment for node :1 with 2 peers:4 and :3 and two services 255, 256 (5)

  9. SPB sub-TLV layout +-----+----+-----------------+--------+------+-------------+| PDU |TLV | SUB-TLV | TYPE | TYPE | #OCCURRENCE |+-----+----+-----------------+--------+------+-------------+ IIH MT-Port-Capability 143 SPB-B-VID 5 1 SPB-Digest 6 1 LSP MT-Capability 144 SPB-Inst 1 1 SPB-I-OALG 2 >=0 SPBM-SI 3 >=0 SPBV-ADDR 4 >=0 MT-Intermediate-System 222 SPB-Metric 12 1 SPB-A-OALG 13 >=0

  10. SPB specific Link Metric - nodal +-+-+-+-+-+-+-+-+ |Type=SPB-Metric| = 12+-+-+-+-+-+-+-+-+| Length | (1 byte)+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| SPB-LINK-METRIC | (3 bytes)+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| Num of ports | (1 byte)+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| Port Identifier | (2 bytes)+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ • Provides a the link metric used for min sum optimization in Disjkstra. • When link metrics differ in each direction uses MAX of both. • Independent of IP link metrics. • Additional identifiers used for construction of a single CIST. • P2P links only.

  11. SPBM Service Identifier (VPN membership) - nodal +-+-+-+-+-+-+-+-+|Type = SPBM-SI | = 3+-+-+-+-+-+-+-+-+| Length | (1 byte)+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| B-MAC ADDRESS | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| B-MAC ADDRESS (6 bytes) | Res. | Base-VID (12 bits) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |T|R| Reserved | ISID #1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |T|R| Reserved | ISID #2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |T|R| Reserved | ISID #n | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ • The work-horse sub-TLV • Indicate that a particular node hosts members of a VPN (ISID). • Indicates properties (Transmit/Receive) of that member • Allows additional addresses B-MACs for multi homing etc.

  12. SPB Instance Identifier - nodal +-+-+-+-+-+-+-+-+|Type = SPB-Inst| = 1+-+-+-+-+-+-+-+-+| Length | (1 byte)+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| CIST Root Identifier (4 bytes) |+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| CIST Root Identifier (cont) (4 bytes) |+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| CIST External ROOT Path Cost (4 bytes) |+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| Bridge Priority | (2 bytes)+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+|R R R R R R R R R R R|V| SPSOURCEID |+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| Num of Trees | (1 bytes)+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| VLAN-ID (1) Tuples (8 bytes) |+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| VLAN-ID (N) Tuples (8 bytes) |+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ A nodes properties – described to all other nodes. VIDs in use, what algorithms associated with VID Data path modes etc.

  13. Hello Extensions IIH +-+-+-+-+-+-+-+-+|Type=SPB-Digest| = 6+-+-+-+-+-+-+-+-+| Length | (1 byte)+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| MCID (50 Bytes) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| Aux MCID (50 Bytes) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| Agreement Digest (32 Bytes) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |RES | A | D|+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+|Type= SPB-B-VID| = 5+-+-+-+-+-+-+-+-+| Length | (1 byte)+-+-+-+-+-+-+-+-+-------------------------------+| ECT - VID Tuple (1) (6 bytes) |+-----------------------------------------------+| ......................... |+-----------------------------------------------+| ECT - VID Tuples (N) (6 bytes) |+-----------------------------------------------+

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