IPv6 migration approaches enabled by. MPLS. • 6PE approach: IPv6 Provider
Edge Router over MPLS/IPv4. • Cisco IOS 6PE configuration. • Conclusions ...
Cisco IOS IPv6 Provider Edge Router (6PE) over MPLS Patrick Grossetete Cisco Systems Cisco IOS IPv6 Product Manager
[email protected] © 2001, Cisco Systems, Inc. All rights reserved.
1
Agenda
• IPv6 migration approaches enabled by MPLS • 6PE approach: IPv6 Provider Edge Router over MPLS/IPv4 • Cisco IOS 6PE configuration • Conclusions
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
2
Key Markets where MPLS will facilitate IPv6 Migration • Wireless 2.5G/3G mobile phone, PDAs, Car’s networks…
• Service Providers Mobile ISPs, Greenfield ISPs, Regional ISPs and Carriers
• Academic and Research Networks
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
3
3GPP/UMTS Example Alternative Access Network
IPv6 Mandated
Legacy mobile signaling network
Applications & Services*) SCP
GPRS Access Network
R-SGW Mh
PS Domain
Ms
TE
MT R
BSS/GRAN
Um
CSCF
Iu A Iu
TE
MT R
Mg
Mr
Gi Gf
Gb
Mm
Cx
EIR
MPLS offers ATM + IP + IPv6 switching
Mw
CAP HSS *) Gr
MRF Gi
Gc
SGSN
Gi MGCF
Gi MGW
MGW Nb Mc
MS Circuit Switch Access Network
T-SGW *)
Iu 1 2
IM Domain
Mc
GGSN Gn
UTRAN
Uu
Multimedia IP Networks
CSCF
PSTN/ Legacy/External
Mc
Iu
Nc MSC server
CS Domain
GMSC server
T-SGW *)
C
CAP CAP
D
Applications & Services*) Signalling Interface Signalling and Data Transfer Interface
Mh HSS *)
R-SGW *) *) those elements are duplicated for figure layout purpose only, they belong to the same logical element in the reference model
IM Domain is now a sub-set of the PS Domain Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
4
IPv6 over MPLS Deployment Scenarios • Many ways to deliver IPv6 services to End Users Most important is End to End IPv6 traffic forwarding
• Many Service Providers have already deployed MPLS in their IPv4 backbone for various reasons MPLS/VPN, MPLS/QoS, MPLS/TE, ATM + IP switching
• MPLS can be used to facilitate IPv6 integration • Multiple approaches for IPv6 over MPLS: IPv6 CE-to-CE IPv6 over IPv4 Tunnels IPv6 over “Circuit_over_MPLS” Native IPv6 MPLS IPv6 Provider Edge Router (6PE) over MPLS Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
5
IPv6 Tunnels configured on CE IPv6 over IPv4 Tunnels v6 Dual Stack IPv4-IPv6 CE routers
IPv6 IPv4
v4
PE
P
P
PE
v6
Dual Stack IPv4-IPv6 CE routers
OC48/192 v6
IPv6 IPv4
v4
• • • • • •
v6
P PE
P IPv4
v4 PE
No impact on existing IPv4 or MPLS Core (IPv6 unaware) Only CEs have to be IPv6-aware (Dual stack) Mesh of IPv6 over IPv4 Tunnels CE-to-CE Overhead: IPv4 header + MPLS header MPLS/VPN support IPv4-native and IPv6 tunnels Service Provider can’t delegate his IPv6 prefix to the CE routers
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
6
IPv6 over “Circuit_over_MPLS” Circuit_over_MPLS (eg. ATM VC, FR PVC, Ethernet,…) v6
IPv6
IPv6 routers
v6
• • • •
IPv6
P
P
P
P “Circuit”
IPv6
v6
IPv6 v6
IPv6
No impact on existing IPv4 or MPLS Core (IPv6 unaware) Edge MPLS Routers need to support “Circuit_over_MPLS” Mesh of “Circuit_Over_MPLS” PE-to-PE PE routers can also be regular IPv6 Routers (IPv6 over ATM, IPv6 over FR, IPv6 over Ethernet,…) to aggregate Customer’s IPv6 routers
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
7
Native MPLS Support of IPv6 MPLS Label Switch Paths for IPv6 v6
v6
IPv6
IPv6
P
P
P
P
IPv6
IPv6 MPLS
IPv6
v6
v6
IPv6 All routers are IPv6-aware
• Core Infrastructure requires full Control Plane upgrade to IPv6 • IPv6 Routing in core • IPv6 Label Distribution Protocol in core
• Dual Control Plane management if IPv4 and IPv6 services Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
8
Agenda
• IPv6 migration approaches enabled by MPLS • 6PE approach: IPv6 Provider Edge Router over MPLS/IPv4 • Cisco IOS 6PE configuration • Conclusions
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
9
IPv6 Provider Edge Router (6PE) over MPLS MP-iBGP sessions v6 2001:0420::
2001:0620:: v6 145.95.0.0
v4
6PE
P
P
6PE
Dual Dual Stack Stack IPv4-IPv6 IPv4-IPv6 routers routers 2001:0621::
Dual Dual Stack Stack IPv4-IPv6 IPv4-IPv6 routers routers
v6
P
CE
6PE 192.76.10.0
v4
P
IPv4 MPLS
CE
• • • •
v6 2001:0421::
6PE v4
192.254.10.0
CE
IPv4 or MPLS Core Infrastructure is IPv6-unaware PEs are updated to support Dual Stack/6PE IPv6 reachability exchanged among 6PEs via iBGP (MP-BGP) IPv6 packets transported from 6PE to 6PE inside MPLS
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
10
6PE Overview MP-BGP sessions 2001:0620:: v6 145.95.0.0
2001:0621::
v4
v6
IPv6
v4
v6 2001:0420::
IPv4
6PE
IPv6
P
P
P
P
6PE
v4 192.254.10.0
6PE
Dual Stack
V6: IGP/BGP
v6 2001:0421::
IPv6
IPv4
6PE
IPv4 192.76.10.0
IPv6
Dual Stack IGPv4 MPLS V4: - LDPv4 - (TE v4)
V6: IGP/BGP
IPv6 unaware No core upgrade Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
11
6PE Routing MP-BGP advertises 2001:0421:::: MPand binds a (2nd level) label IPv6 Next Hop is an IPv4 compatible IPv6 address built from 192.254.10.17 2001:0420::
IGPv4 advertises reachability of 192.254.10.17
2001:0421::
192.72.170.13
6PE-1 LDPv4 binds label to 192.254.10.17
192.254.10.17
6PE-2 P1
P2
• Translation of v6 BGP Next_Hop into v4address • Recursion of this address via IGPv4 Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
12
6PE Routing/Label Distribution IGPv6 or MP-BGP advertising 2001:0421:: 2001:0420::
6PE-2 sends MP-iBGP advertisement to 6PE-1 which says: 2001:0421:: is reachable via BGP Next Hop = 192.254.10.17 (6PE-2) bind BGP label to 2001:0421:: (*) IGPv4 advertises reachability of 192.254.10.17
6PE-1
2001:0421::
192.72.170.13
6PE-2 P2
P1 LDPv4 binds label to 192.254.10.17
192.254.10.17
IGPv6 or MP-BGP advertising 2001:0421::
(*) The 2nd label allows operations with Penultimate Hop Popping (PHP) (which is typically used in current MPLS networks)- it is an Aggregate label Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
13
6PE Forwarding 2001:0420::
IPv6 packet to 2001:0421::
2001:0421::
192.72.170.13
6PE-1
6PE-2
192.254.10.17
P1
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
P2
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6PE Forwarding (6PE-1) 2001:0420::
IPv6 packet to 2001:0421::
192.72.170.13
6PE-1
IPv6 Forwarding and Label Imposition: • 6P 6PE E-1 receives an IPv6 IP v6 packet • Lookup is done on IPv6 prefix • Result is: Labelz binded by MPMP-BGP to 2001:0421:: Label1 binded by LDP/IGPv4 to the IPv4 address of BGP Next Hop (6PE--2) (6PE
2001:0421::
6PE-2 MP -BGP label IPv6 packet MPLDP/IGPv4 label1 to 6PE6PE-2 To 2001:421:: To 2001:421::
192.254.10.17
P1
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
P2
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6PE Forwarding (P1) IPv6-UNaware MPLS Label Switching:
2001:0420::
IPv6 packet to 2001:0421::
192.72.170.13
•P1 receives an MPLS packet •Lookup is done on Label1 •Result is Label2
2001:0421::
6PE-1
6PE-2 MP -BGP label IPv6 packet MPLDP/IGPv4 label1 to 6PE6PE-2 To 2001:421:: To 2001:421::
192.254.10.17
P2
P1 LDP/IGPv4 label2 to 6PE6PE-2
Presentation_ID
MP -BGP label MPTo 2001:421::
© 2001, Cisco Systems, Inc. All rights reserved.
IPv6 packet To 2001:421::
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6PE Forwarding (P2) IPv6-UNaware MPLS Label Switching:
2001:0420::
IPv6 packet to 2001:0421::
192.72.170.13
•P2 receives an MPLS packet •Lookup is done on Label2 •Result includes Pop label (PHP)
2001:0421::
6PE-1
6PE-2 MP -BGP label IPv6 packet MPLDP/IGPv4 label1 to 6PE6PE-2 To 2001:421:: To 2001:421::
192.254.10.17
P2
P1 LDP/IGPv4 label2 to 6PE6PE-2
Presentation_ID
MP -BGP label MPTo 2001:421::
© 2001, Cisco Systems, Inc. All rights reserved.
IPv6 packet To 2001:421::
MP -BGP label IPv6 packet MPTo 2001:421:: To 2001:421::
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6PE Forwarding (6PE-2) MPLS Label Pop and IPv6 Forwarding : 2001:0420::
IPv6 packet to 2001:0421::
• • • 192.72.170.13
6PE-1
6PE-2 receives an MPLS packet Lookup is done on Label Result is: Pop the label & do IPv6 lookup on IPv6 destination 6PE-2
2001:0421::
IPv6 packet To 2001:421::
MP -BGP label IPv6 packet MPLDP/IGPv4 label1 to 6PE6PE-2 To 2001:421:: To 2001:421::
192.254.10.17
P2
P1 LDP/IGPv4 label2 to 6PE6PE-2
Presentation_ID
MP -BGP label MPTo 2001:421::
© 2001, Cisco Systems, Inc. All rights reserved.
IPv6 packet To 2001:421::
MP -BGP label IPv6 packet MPTo 2001:421:: To 2001:421::
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Cisco IOS releases for 6PE
• 12.0(22)S on Cisco 12000 series • 12.2(11)S on Cisco 7200/7400/7500 series Next release on Cisco 7600
• 12.2(6th)T on Cisco 3600/3700/7200/7500 • Contact your Cisco Local team for latest update
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
19
6PE Standardization • See : “BGP Tunnelling” • Co-authored by Cisco • Generic solution for transport of IPv6 over any tunnelling technique (including MPLS) using MP-BGP • IETF Working Group document • 6PE is Cisco IOS implementation of “BGP Tunnelling” over MPLS Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
20
6PE Benefits For SPs already running MPLS, 6PE approach has many benefits: • Core Infrastructure needs no upgrade and no configuration change • Upgrade only on the required edge routers (ie upgrade of existing PEs to 6PE, or add separate 6PEs) • IPv6 supported simultaneously with existing MPLS services (MPLS v4_VPNs, QoS, ATM, v4 Internet, …)
è 6PE allows IPv6 to be deployed over existing MPLS Multiservice infrastructure with marginal operational impact/cost /risk Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
21
6PE Benefits MP-BGP sessions
2001:0620:: v6 145.95.0.0
2001:0621::
v4
6PE
v6
6PE 192.76.10.0 v4
v6IGP MP-BGP
P
P
P
P
IPv4 MPLS
v6 2001:0420::
6PE
v6 2001:0421::
v4 192.254.10.0
6PE
IPv6 CE only has a single Routing Peer (PE) regardless of how many remote IPv6 CEs it communicates with No change on an IPv6 CE when remote CEs are added/removed (reachability automatically learnt) No tunnel/”circuit” to be configured è 6PE offers scalable and flexible solution (benefits are analogous to RFC2547bis layer 3 VPN solution for IPv4) Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
22
6PE Benefits MP-BGP sessions
2001:0620:: v6
v6 2001:0420:: CE
145.95.0.0
2001:0621::
v6
6PE
v6 CE
6PE 192.76.10.0 v6
P
P
P
P
IPv4 MPLS
v6 2001:0421::
6PE
v4 192.254.10.0
6PE
CE
CE
à6PE solution can be easily extended to support same VPN services for IPv6 as currently supported for IPv4 with RFC2457bis (isolation, Internet access, QoS…) Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
23
6PE Cons MP-BGP sessions
2001:0620:: v6
v6 2001:0420:: CE
145.95.0.0
2001:0621::
v4
6PE
v6 CE
6PE 192.76.10.0 v4
P
P
P
P
IPv4 MPLS
v6 2001:0421::
6PE
v4 192.254.10.0
6PE
CE
CE
• Only makes sense where network already runs MPLS • Requires knowledge of MPLS and BGP technologies • Requires dual-stack and software upgrade on existing PE or deployment of dedicated 6PE routers Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
24
Agenda
• IPv6 migration approaches enabled by MPLS • 6PE approach: IPv6 Provider Edge Router over MPLS/IPv4 • Cisco IOS 6PE configuration • Conclusions
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
25
6PE Configuration Commands
• Two new Commands: router(config-router-af)# neighbor send-label Enables binding and advertisement of aggregate labels when advertising ipv6 prefixes in BGP
router(config)# mpls ipv6 source-interface Specifies the interface from which to inherit ipv6 addresses for locally generated packets
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
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6PE Show Commands • Three show commands extended show bgp ipv6 displays the mpls label value advertized for the IPv6 prefix
show bgp ipv6 neighbor displays the mpls label capability negotiated with the BGP peer
show mpls forwarding-table 6PE labels are displayed with outgoing tag as “Aggregate” and prefix as “6PE imposition”
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
27
6PE configuration 6CE
ipv6 cef mpls label protocol ldp
6PE
Staticv6 RIPv6 ISISv6 eBGPv6
ip cef mpls label protocol ldp tag-switching tdp router-id loopback0 ! interface Serial2/0 ip address 10.10.10.2 255.255.255.252 ip router isis mpls label protocol ldp tag-switching ip ! Presentation_ID
mpls ipv6 source-interface Loopback0
P
mpls ldp router-id loopback0 ! interface Loopback0 ip address 10.10.20.2 255.255.255.255 ipv6 address 2003::/64 eui-64 ! router bgp 100 no synchronization no bgp default ipv4-unicast bgp log-neighbor-changes neighbor 10.10.20.1 remote-as 100 neighbor 10.10.20.1 update-source Loopback0 ! address-family ipv6 neighbor 10.10.20.1 activate
neighbor 10.10.20.1 send-label redistribute connected redistribute rip ripv6CE1 exit-address-family ! © 2001, Cisco Systems, Inc. All rights reserved.
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Show bgp ipv6
Router> show bgp ipv6 2003:1:1:30::/64 BGP routing table entry for 2003:1:1:30::/64, version 2 Paths: (1 available, best #1, table Global-IPv6-Table) Not advertised to any peer Local ::FFFF:10.10.20.1 (metric 10) from 10.10.20.1 (192.168.254.1) Origin incomplete, metric 0, localpref 100, valid, internal, best
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
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Show bgp ipv6 neighbor Router> show bgp ipv6 neighbors 10.10.20.1 BGP neighbor is 10.10.20.1, remote AS 100, internal link BGP version 4, remote router ID 192.168.254.1 BGP state = Established, up for 00:04:07 Last read 00:00:07, hold time is 180, Neighbor capabilities: Route refresh: advertised and received(old & new) Address family IPv6 Unicast: advertised and received ipv6 MPLS Label capability: advertised and received For address family: IPv6 Unicast BGP table version 2, neighbor version 2 Index 1, Offset 0, Mask 0x2 Route refresh request: received 0, sent 0 Sending Prefix & Label 2 accepted prefixes consume 144 bytes Prefix advertised 1, suppressed 0, withdrawn 0 Number of NLRIs in the update sent: max 1, min 0 Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
30
Show mpls forwarding-table
Router> show mpls forwarding-table Local Outgoing Prefix tag tag or VC or Tunnel Id 16 16 10.10.20.4/32 17 Pop tag 10.10.10.0/30 18 Pop tag 10.10.20.3/32 19 18 10.10.40.0/30 20 19 10.10.20.2/32
Bytes tag switched 0 0 0 0 0
21
2080
Presentation_ID
Aggregate
IPv6
© 2001, Cisco Systems, Inc. All rights reserved.
Outgoing interface Se0/0 Se0/0 Se0/0 Se0/0 Se0/0
Next Hop point2point point2point point2point point2point point2point
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Show ipv6 route Router> show ipv6 route IPv6 Routing Table - 4 entries Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea B 2003:1:1:30::/64 [200/0] via ::FFFF:10.10.20.1, IPv6-mpls L 2003::205:32FF:FEC3:40E1/128 [0/0] via ::, Loopback0 C 2003::/64 [0/0] via ::, Loopback0 L FE80::/64 [0/0] via ::, Null0
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
32
Agenda
• IPv6 migration approaches enabled by MPLS • 6PE approach: IPv6 Provider Edge Router over MPLS/IPv4 • Cisco IOS 6PE configuration • Conclusions
Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
33
Conclusions • IPv6 migration does not “need” MPLS … but, where MPLS is deployed, it enables attractive approaches for IPv6 migration • Cisco IPv6 and MPLS solutions provides the broadest deployment scenario feature set • Cisco’s 6PE is one such IPv6 migration approach over IPv4 MPLS, which offers IPv6 deployment at marginal cost/risk: no upgrade/reconfig in IPv4/MPLS core IPv6 simultaneously with IPv4, IPv4 VPNs, ATM, … Presentation_ID
© 2001, Cisco Systems, Inc. All rights reserved.
34
Presentation_ID
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© 2001, Cisco Systems, Inc.
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