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© 2009 Cisco Systems, Inc. All rights reserved. Cisco Public Presentation_ID 1 BGP-Prefix Segment in large-scale data centers draft-filsfils-spring-segment-routing-msdc-00.

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Presentation on theme: "© 2009 Cisco Systems, Inc. All rights reserved. Cisco Public Presentation_ID 1 BGP-Prefix Segment in large-scale data centers draft-filsfils-spring-segment-routing-msdc-00."— Presentation transcript:

1 © 2009 Cisco Systems, Inc. All rights reserved. Cisco Public Presentation_ID 1 BGP-Prefix Segment in large-scale data centers draft-filsfils-spring-segment-routing-msdc-00 Clarence Filsfils – Cisco Systems Stefano Previdi – Cisco Systems Jon Mitchell – Microsoft Corporation Benjamin Black – Microsoft Corporation Dmitry Afanasiev – Yandex Saikat Ray – Cisco Systems Keyur Patel – Cisco Systems IETF91, November 2013, Honolulu, US

2 2 Purpose  Segment routing use case in BGP+MPLS based MSDC  No new requirements on Spring. BGP extensions are presented in IDR  Illustration of Prefix-SID Egress Peer Engineering Capacity optimization Incremental deployment Anycast

3 3 Reference topology Tier-3 +-----+ |NODE | +->| 5 |--+ | +-----+ | Tier-2 | | Tier-2 +-----+ | +-----+ | +-----+ +------------>|NODE |--+->|NODE |--+--|NODE |-------------+ | +-----| 3 |--+ | 6 | +--| 9 |-----+ | | | +-----+ +-----+ +-----+ | | | | | | | | +-----+ +-----+ +-----+ | | | +-----+---->|NODE |--+ |NODE | +--|NODE |-----+-----+ | | | | +---| 4 |--+->| 7 |--+--| 10 |---+ | | | | | | | +-----+ | +-----+ | +-----+ | | | | | | | | | | | | | | +-----+ +-----+ | +-----+ | +-----+ +-----+ |NODE | |NODE | Tier-1 +->|NODE |--+ Tier-1 |NODE | |NODE | | 1 | | 2 | | 8 | | 11 | | 12 | +-----+ +-----+ +-----+ +-----+ +-----+ | | | | | | | | A O B O Z O O O  Node ‘x’ has ASN ‘x’  BGP IPvX labeled-unicast sessions (3107) between directly connected nodes  Node ‘x’ has loopback 1.1.1.x/32  Loopbacks are redistributed into BGP and advertised  Tier-2 and Tier-3 nodes: MPLS forwarding  Tier-1 nodes: IP2MPLS or MPLS2MPLS forwarding  SRGB: [16000, 23999]  Label index for 1.1.1.x/32 is ‘x’

4 4 BGP Prefix SID: Control and dataplane Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 -o

5 5 BGP Prefix SID: Control and dataplane Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- -o

6 6 BGP Prefix SID: Control and dataplane Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.17.1 ASPATH: {10, 11} Label-Index attr: 11 -o

7 7 BGP Prefix SID: Control and dataplane Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 16011 | 10 1.1.1.11/32 | 16011 | 10 ------------------+----------+----------- BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.17.1 ASPATH: {10, 11} Label-Index attr: 11 -o

8 8 BGP Prefix SID: Control and dataplane Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 16011 | 10 1.1.1.11/32 | 16011 | 10 ------------------+----------+----------- BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.17.1 ASPATH: {10, 11} Label-Index attr: 11 BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.47.1 ASPATH: {7, 10, 11} Label-Index attr: 11 -o

9 9 BGP Prefix SID: Control and dataplane Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 16011 | 10 1.1.1.11/32 | 16011 | 10 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 16011 | ECMP{7, 8} 1.1.1.11/32 | 16011 | ECMP{7, 8} ------------------+----------+----------- BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.17.1 ASPATH: {10, 11} Label-Index attr: 11 BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.47.1 ASPATH: {7, 10, 11} Label-Index attr: 11 -o

10 10 BGP Prefix SID: Control and dataplane Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 16011 | 10 1.1.1.11/32 | 16011 | 10 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 16011 | ECMP{7, 8} 1.1.1.11/32 | 16011 | ECMP{7, 8} ------------------+----------+----------- BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.17.1 ASPATH: {10, 11} Label-Index attr: 11 BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.47.1 ASPATH: {7, 10, 11} Label-Index attr: 11 BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.41.1 ASPATH: {4, 7, 10, 11} Label-Index attr: 11 -o

11 11 BGP Prefix SID: Control and dataplane Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 16011 | 10 1.1.1.11/32 | 16011 | 10 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 16011 | ECMP{7, 8} 1.1.1.11/32 | 16011 | ECMP{7, 8} ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 16011 | ECMP{3, 4} 1.1.1.11/32 | 16011 | ECMP{3, 4} ------------------+----------+----------- BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.17.1 ASPATH: {10, 11} Label-Index attr: 11 BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.47.1 ASPATH: {7, 10, 11} Label-Index attr: 11 BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.41.1 ASPATH: {4, 7, 10, 11} Label-Index attr: 11 -o

12 12 BGP Prefix SID: Non-SR node in the middle Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 -o

13 13 Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- -o BGP Prefix SID: Non-SR node in the middle

14 14 Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.17.1 ASPATH: {10, 11} Label-Index attr: 11 -o BGP Prefix SID: Non-SR node in the middle

15 15 Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 12345 | 16011 | 10 1.1.1.11/32 | 16011 | 10 ------------------+----------+----------- BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.17.1 ASPATH: {10, 11} Label-Index attr: 11 -o BGP Prefix SID: Non-SR node in the middle

16 16 Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 12345 | 16011 | 10 1.1.1.11/32 | 16011 | 10 ------------------+----------+----------- BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.17.1 ASPATH: {10, 11} Label-Index attr: 11 BGP UPDATE NLRI: (12345)1.1.1.11/32 NH: 192.168.47.1 ASPATH: {7, 10, 11} Label-Index attr: 11 -o BGP Prefix SID: Non-SR node in the middle

17 17 Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 12345 | 16011 | 10 1.1.1.11/32 | 16011 | 10 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 12345 | ECMP{7, 8} 1.1.1.11/32 | 12345 | ECMP{7, 8} ------------------+----------+----------- BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.17.1 ASPATH: {10, 11} Label-Index attr: 11 BGP UPDATE NLRI: (12345)1.1.1.11/32 NH: 192.168.47.1 ASPATH: {7, 10, 11} Label-Index attr: 11 -o BGP Prefix SID: Non-SR node in the middle

18 18 Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 12345 | 16011 | 10 1.1.1.11/32 | 16011 | 10 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 12345 | ECMP{7, 8} 1.1.1.11/32 | 12345 | ECMP{7, 8} ------------------+----------+----------- BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.17.1 ASPATH: {10, 11} Label-Index attr: 11 BGP UPDATE NLRI: (12345)1.1.1.11/32 NH: 192.168.47.1 ASPATH: {7, 10, 11} Label-Index attr: 11 BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.41.1 ASPATH: {4, 7, 10, 11} Label-Index attr: 11 -o BGP Prefix SID: Non-SR node in the middle

19 19 Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 BGP UPDATE NLRI: (3)1.1.1.11/32 NH: 192.168.110.1 ASPATH: {11} Label-Index attr: 11 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | POP | 11 1.1.1.11/32 | N/A | 11 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 12345 | 16011 | 10 1.1.1.11/32 | 16011 | 10 ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 12345 | ECMP{7, 8} 1.1.1.11/32 | 12345 | ECMP{7, 8} ------------------+----------+----------- ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 16011 | 16011 | ECMP{3, 4} 1.1.1.11/32 | 16011 | ECMP{3, 4} ------------------+----------+----------- BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.17.1 ASPATH: {10, 11} Label-Index attr: 11 BGP UPDATE NLRI: (12345)1.1.1.11/32 NH: 192.168.47.1 ASPATH: {7, 10, 11} Label-Index attr: 11 BGP UPDATE NLRI: (16011)1.1.1.11/32 NH: 192.168.41.1 ASPATH: {4, 7, 10, 11} Label-Index attr: 11 -o BGP Prefix SID: Non-SR node in the middle

20 20 BGP Egress Peer Engineering Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ------------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+------------+----------- 16011 | 16011 | ECMP{3, 4} 1.1.1.11/32 | 16011 | ECMP{3, 4} 184.73.248.59/32 | 16011 | ECMP{3, 4} ------------------+------------+----------- -o ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 184.73.248.59/32 | POP | 13 | | ------------------+----------+----------- Node 13 Node 12 A Controller ------------------------------------------- | outgoing | Outgoing IP destination | label | Interface ------------------+------------+----------- 0.0.0.0/32 | POP | 1 | | ------------------+------------+-----------

21 21 BGP Egress Peer Engineering Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ------------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+------------+----------- 16011 | 16011 | ECMP{3, 4} 1.1.1.11/32 | 16011 | ECMP{3, 4} 184.73.248.59/32 | 16011 | ECMP{3, 4} ------------------+------------+----------- -o ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 184.73.248.59/32 | POP | 13 9999 | POP | 12 ------------------+----------+----------- Node 13 Node 12 A Controller ------------------------------------------- | outgoing | Outgoing IP destination | label | Interface ------------------+------------+----------- 0.0.0.0/32 | POP | 1 | | 1 ------------------+------------+----------- BGPLS

22 22 BGP Egress Peer Engineering Node 11 Node 10 Node 7 Node 1 Node 4 1.1.1.11/32 192.168.110.0/24.1 192.168.17.0/24.2.1 192.168.47.0/24.1.2 192.168.41.0/24.2 ------------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+------------+----------- 16011 | 16011 | ECMP{3, 4} 1.1.1.11/32 | 16011 | ECMP{3, 4} 184.73.248.59/32 | 16011 | ECMP{3, 4} ------------------+------------+----------- -o ----------------------------------------- Incoming label | outgoing | Outgoing or IP destination | label | Interface ------------------+----------+----------- 184.73.248.59/32 | POP | 13 9999 | POP | 12 ------------------+----------+----------- Node 13 Node 12 A Controller ------------------------------------------- | outgoing | Outgoing IP destination | label | Interface ------------------+------------+----------- 0.0.0.0/32 | POP | 1 184.73.248.59/32 | 16011, 9999| 1 ------------------+------------+----------- BGPLS

23 23 Capacity optimization  Steer packets using label stack at ingress  Normal (min cost) path from A to Z is via node 5  Node 5 is congested  A uses {16004, 16011} or {16008, 16011}  Packets traverse via lower paths Tier-3 +-----+ |NODE | +->| 5 |--+ | +-----+ | Tier-2 | | Tier-2 +-----+ | +-----+ | +-----+ +------------>|NODE |--+->|NODE |--+--|NODE |-------------+ | +-----| 3 |--+ | 6 | +--| 9 |-----+ | | | +-----+ +-----+ +-----+ | | | | | | | | +-----+ +-----+ +-----+ | | | +-----+---->|NODE |--+ |NODE | +--|NODE |-----+-----+ | | | | +---| 4 |--+->| 7 |--+--| 10 |---+ | | | | | | | +-----+ | +-----+ | +-----+ | | | | | | | | | | | | | | +-----+ +-----+ | +-----+ | +-----+ +-----+ |NODE | |NODE | Tier-1 +->|NODE |--+ Tier-1 |NODE | |NODE | | 1 | | 2 | | 8 | | 11 | | 12 | +-----+ +-----+ +-----+ +-----+ +-----+ | | | | | | | | A O B O Z O O O

24 24 Other considerations  Anycast: Assigning the same label-index to an anycast loopback interface address (residing on multiple nodes) achieves load-balanced reachability (to any of the nodes).  Minimizing the FIB table: The user can only use MPLS forwarding in Tier-2 and Tier-3 nodes. In such cases, the IP part of the FIB need not be programmed.  Operational simplicity: RSVP/LDP is no longer needed Use of same SRGB on all nodes leads to the same label value for a given prefix on all nodes. This drastically simplifies troubleshooting. A controller device can uniformly program label stack to hosts.

25 25 Summary  This document presents an use case for segment routing in BGP+MPLS based MSDC  The design illustrated retains multiple benefits Bandwidth and traffic patterns Capex/opex minimization Traffic engineering Fast routing convergence Anycast/load-balancing Operationally simplified MPLS dataplane Egress peer engineering Capacity optimization Incremental deployment

26 26 Questions/Comments?

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