橡MPLS-Japan-shared-fastreroute.PDF

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れんかさくいし
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1 MPLS - Fast Reroute NEC a-iwata@ah.jp.nec.com TEL: , FAX:

2 (1) (2) (3) Fast Reroute Cisco Juniper Axiowave (4) Shared Fast Reroute NEC (5) Interoperability OAM (6) 2

3 #1 MPLS LSP V.Sharma (Jasmine Networks), Framework for MPLS-based recovery, draft-ietf-mpls-recovery-frmwrk-03.txt, Jul (1) Rerouting (a) established-on-demand( ) (b) pre-qualified ( (2) Protection switching pre-established ( ) Protection switching (1) 1+1: Working / Recovery path (2) 1:1 : Working path Recovery path Recovery path Traffic ( Preemption priority) 3

4 #2 3 Local Repair (fast reroute) Link Recovery / Restoration Node Recovery / Restoration Backup LSP Primary LSP Primary LSP Global Repair Switch-over Backup LSP Alternate Repair Notify Primary LSP Notify Switch-over Primary LSP Backup LSP Switch-overBackup LSP Dual-homing 4

5 #3 Rerouting Protection (1+1) Protection (1:1) Local Repair (Link) Local Repair (Node) Global Repair Alternate Repair * * * Pri user Pri user Pri user Pri user Fast Reroute(FRR) *: Local repair/global repair 5

6 Local Repair (Fast Reroute) Cisco R.Goguen e al., RSVP Label Allocation for Backup Tunnels, draft-swallow-rsvp-bypass-label-01.txt, Nov.2000 Juniper D. Gan et al., A Method for MPLS LSP Fast-Reroute Using RSVP Detours, draft-gan-fast-reroute-00.txt, Apr.2001 Axiowave D. Haskin et al., A Metho for Setting an Alternative Label Switched Paths to Handle Fast Reroute, draft-haskin-mplsfast-reroute-05.txt, Nov.2000 NEC (Shared Fast Reroute) A. Iwata et al., MPLS Signaling Extensions for Shared Fast Rerouting, draft-iwata-shared-fastreroute-00.txt, Jul

7 Cisco FRR: Bypass Tunnel #1 Label-stack Tunnel PLR LSP Switch-over PLR (Point of Local Repair) Merge node Tunnel Label Label-stack Tunnel IP-PDU Merge-node Tunnel-label 7

8 Cisco FRR: Bypass Tunnel #2 PLR Merge-node Working path (Primary path) Label Hop-by-hop Label Merge node Global label space I/F Switch-over Merge PHP PLR Merge node Label-stack Tunnel Primary Path Bypass Tunnel Label IP-PDU Merge node 1 Penultimate Hop Pop (PHP) Tunnel-label Primary path 8

9 Cisco FRR: Bypass Tunnel #3 Loca Repair Global Repair PLR Merge-node PathErr Notify:local repair) PLR Merge-node Switch-over Local Repair Switch-over Global Repair 9

10 Juniper FRR #1 Primary LSP Backup #1 Primary LSP Backup LSP 1 Switch-over Backup LSP #2 Backup LSP Cisco LSP Ingress PATH (Fast-Reroute obj) Primary Primary LSP RESV RESV(Record Route obj) Record_Route object PATH (Detour obj) RESV CSPF Backup LSP #3 Backup LSP #1 10

11 Juniper FRR #2 PATH Message (for Primary LSP) Fast Reroute object Length (bytes) Class-Num C-Type Setup Prio Hold Prio Hop-limit Reserved Bandwidth Exclude colors Include colors PATH Message (For Backup LSP) Detour object Length (bytes) Class-Num C-Type Source ID Downstream Node ID Preemption Priority PLR 11

12 Axiowave FRR #1 Backup LSP#1 Primary LSP Backup LSP#2 Primary LSP Disjoint path Backup LSP#1,#2 Backup LSP #2 Backup LSP #1 Ingress Ingress Primary LSP Backup LSP #2 Backup LSP #1 Ring Local Wrapping Primary LSP 12

13 Axiowave FRR #2 Ingress LSP Backup LSP #2 Backup LSP #1 Ingress Ingress Backup LSP#2 Primary LSP Encapsulated Reordering Backup LSP Ingress Buffering Label-stack LSP #2 Label-stack LSP #1 Ingress Label Stacking Backup LSP Primary LSPs node Global Label Space Label Global Label 1:1, N:1 Protection 13 Space

14 Axiowave FRR #3 Restoration Shortcut Backup LSP #2 VoIP Delay Backup LSP #1 sensitive Ingress FRR Primary LSP Transit node Shortcut LSP Shortcut path Shortcut path 14

15 Local Repair Cisco / Juniper / Axiowave : SONET protection 50 msec restoration Backup LSP (Local Repair LSP) => Backup LSP Backup LSP S. Kini et al., Draft-kini-restoration-shared-backup-01.txt Backup LSP => OSPF / ISIS => Fast-reroute (FRR) => FRR (NEC Shared Fast Reroute ) 15

16 NEC FRR - Shared Fast Reroute - (2) Shared fast-reroute (3) Shared fast reroute (I) primary LSP (ii) load-balanced primary LSP (4) RSVP-TE signaling (I) Ingress CSPF (ii) Ingress node CSPF (iii) Ingress CSPF (5) 16

17 Shared fast-reroute (1) Backup LSP LSP 2 (I) Label merge: LSP (label ID ) (ii) Logical merge: Label (2) Backup LSP (I) Primary LSP Backup LSP (ii) Primary LSP Backup LSPs S.Kini >> (I) 17

18 Shared fast reroute - primary LSP - Primary path Ingress Primary LSP backup LSP (CSPF) #1 #2 #3 Juniper Backup LSPs Backup LSP Backup LSP #1 LSP #2, #3 Ingress Label merge #1 #2 #3 BW is shared Label merge Label 18

19 Shared fast reroute - load-balanced primary LSP #1- Ingress pair Ingress X% Load balancing Load splitting 100-X% X% for #1, 100-X% for #2 Primary LSP #1 Primary LSP #2 (1) Primary LSP #1, #2 Backup LSP #3 >> N load balanced LSP Ingress #1 #2 #3 Max{x, 100-x}(%) Backup LSP #3 19

20 Shared fast reroute - load-balanced primary LSP #2- (2) primary LSP #1, #2 Ingress X% Backup LSP #1, #2 100-X% >> N load balanced LSP Ingress Primary LSP #1 Primary LSP #2 #1 #1 #2 #2#3#3 Ingress Label merge #2 #2#3#3 20

21 RSVP-TE signaling - Ingress CSPF - Primary LSP Backup LSP Ingress, N2, N3 CSPF Backup LSP Ingress Primary LSP Disjoint Backup LSP #1 Backup LSP Trigger ERO#1 (Backup LSP#1 N2 Backup LSP N2 ERO#1 CSPF Nth backup LSP Backup LSP#1 CSPF Ingress Trigger (ERO #1) N2 N3 #1 #2 #3 IngressN2 N5 N5 PATH #1 RESV #1 N3 PATH #2 N6 N6 RESV #2 PATH #3 Label merge RESV #3 Backup LSP Trigger Ack 21

22 RSVP-TE signaling -Ingress node CSPF - Primary LSP Ingress N2 N3 Backup LSP Ingress, N2, N3 #1 #2 #3 CSPF Backup LSP N5 N6 Ingress Backup LSP ERO#1, ERO#2, ERO#3 Ingress Backup LSP IngressN2 Backup LSP Trigger (ERO #1) N5 PATH #1 RESV #1 N3 PATH #2 Backup LSP Trigger Ack N6 RESV #2 PATH #3 Label merge RESV #3 22

23 RSVP-TE signaling overview - Ingress CSPF - Ingress N2 N3 Primary LSP Backup LSP #1 #2 #3 Primary LSP Ack (RESV) N5 N6 Backup LSP IngressN2 N5 N3 RESV message Backup LSP ERO LSR Backup LSP RESV #P ERO #2#3 N6 PATH #P RESV #P PATH #3 RESV #P ERO #3 RESV #3 PATH #2 RESV #2 PATH #1 RESV #1 Label merge 23

24 (ALL) Primary LSP Backup LSP Backup LSP (Primary) Primary LSP Backup LSP ALL (Dedicated) Primary LSP Backup LSP ) 100 LSP Traffic (16node,26link): 500, (22node,45link): 300 ALL NS (, LSP ) 24

25 3000 e3 e4 Demand e2 n2 n1 n3 n8 e7 e6 n6 n7 n4 e5 Accommodated Capacity Offered Traffic Demand Shared(ALL) Shared(Primary) Dedicated e1 e8 e2 n2 e1 e6 n3 n1 e3 e4 e7 n7 n5 n4 n8 e5 n6 e8 e11 LSR 0 Accommodated Capacity Request Sequence 3000 Offered Traffic Demand Shared(ALL) 1500 Shared(Primary) 1000 Dedicated 500 n9 n10 e9 n11 e Request Sequence

26 (1) MPLS FRR Interoperability (2) FRR Interoperability A. Atlas (Avici) et al., MPLS RSVP-TE Interoperability for Local Protection/Fast Reroute, draft-atlas-rsvp-local-protectinterop-00.txt, Jul.2001 Cisco, Juniper Interoperability (3) OAM N.Harrison (British Telecom) et al., Requirements for OAM in MPLS Networks, draft-harrison-mpls-oam-req-00.txt, May.2001 OAM 26

27 MPLS (Fast Reroute: FRR) IETF MPLS/CCAMP WG FRR 27

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橡MPLS-Japan-shared-fastreroute.PDF