6PE #
什么是 6PE #
摘录一段华为文档的解释：
6PE（IPv6 Provider Edge）是一种 IPv4 到 IPv6 过渡的技术。通过 6PE 技术，ISP 可以利用已有的 IPv4 骨干网为分散的 IPv6 网络提供接入能力，使得 IPv6 孤岛穿越 IPv4 骨干网进行通信。
- 在基于 MPLS 的 6PE 网络中：6PE 和 CE 之间利用 IPv6 路由协议交换 IPv6 路由信息。
- 6PE 之间利用 MP-BGP 交换 IPv6 路由信息，并为 IPv6 前缀分配 MPLS 标签。
- IPv4 骨干网络中 6PE 和 P 之间利用 IPv4 路由协议交换路由信息，并利用 MPLS 在 6PE 间建立 LSP。
6PE 不涉及 VPN 路由即 VRF，其目的就是为了让 IPv6 孤岛能通过 IPv4 骨干网传输。所以对于骨干网只需要在 PE 侧进行配置即可，如下拓扑，简单测试下 6PE：
配置 #
TOPO 是随便找的测试环境，主要为测了下 6vPE ，所以 6PE 这块就不在 CE/PE 间进行 IPv6 配置， 简单使用 PE1/PE2 loopback 进行连通性测试。AS132203 是 v4 的骨干网环境，配置了 ISIS/LDP。
PE1 #
RP/0/0/CPU0:ios#show run router
router router-convergence
RP/0/0/CPU0:ios#show run router bgp
Thu Sep 17 09:35:26.678 UTC
router bgp 132203
nsr
bfd minimum-interval 500
bfd multiplier 3
bgp router-id 10.100.0.1
address-family ipv6 unicast
redistribute connected
allocate-label all
!
neighbor 10.100.0.3 <<<< 与PE2建立ipv6 label unicast邻居
remote-as 132203
update-source Loopback0
address-family ipv6 labeled-unicast
!
RP/0/0/CPU0:ios#show run int loopback 0
Thu Sep 17 09:35:31.087 UTC
interface Loopback0
ipv4 address 10.100.0.1 255.255.255.255
ipv6 address 2000::1/128
!
PE2 #
RP/0/0/CPU0:ios#show run router bgp
Thu Sep 17 09:48:13.907 UTC
router bgp 132203
nsr
bfd minimum-interval 500
bfd multiplier 3
bgp router-id 10.100.0.3
address-family ipv6 unicast
redistribute connected
allocate-label all
!
neighbor 10.100.0.1
remote-as 132203
update-source Loopback0
address-family ipv6 labeled-unicast
!
RP/0/0/CPU0:ios#show run int lo0
Thu Sep 17 09:49:21.972 UTC
interface Loopback0
ipv4 address 10.100.0.3 255.255.255.255
ipv6 address 2000::3/128
!
连通性检查 #
RP/0/0/CPU0:ios#show bgp ipv6 labeled-unicast summary
Thu Sep 17 09:44:57.719 UTC
BGP router identifier 10.100.0.1, local AS number 132203
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0800000 RD version: 12
BGP main routing table version 12
BGP NSR Initial initsync version 2 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
BGP scan interval 60 secs
BGP is operating in STANDALONE mode.
Process RcvTblVer bRIB/RIB LabelVer ImportVer SendTblVer StandbyVer
Speaker 12 12 12 12 12 0
Neighbor Spk AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down St/PfxRcd
10.100.0.3 0 132203 488 489 12 0 0 05:39:26 1
RP/0/0/CPU0:ios#
RP/0/0/CPU0:ios#show bgp ipv6 labeled-unicast
Thu Sep 17 09:45:03.778 UTC
BGP router identifier 10.100.0.1, local AS number 132203
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0800000 RD version: 12
BGP main routing table version 12
BGP NSR Initial initsync version 2 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
BGP scan interval 60 secs
Status codes: s suppressed, d damped, h history, * valid, > best
i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 2000::1/128 :: 0 32768 ?
*>i2000::3/128 10.100.0.3 0 100 0 ?
Processed 2 prefixes, 2 paths
RP/0/0/CPU0:ios#show bgp ipv6 labeled-unicast 2000::3/128 detail
Thu Sep 17 09:45:12.188 UTC
BGP routing table entry for 2000::3/128
Versions:
Process bRIB/RIB SendTblVer
Speaker 12 12
Flags: 0x00001001+0x00000000;
Last Modified: Sep 17 04:05:36.288 for 05:39:35
Paths: (1 available, best #1)
Not advertised to any peer
Path #1: Received by speaker 0
Flags: 0x4000000001060005, import: 0x20
Not advertised to any peer
Local
10.100.0.3 (metric 20000) from 10.100.0.3 (10.100.0.3)
Received Label 24007
Origin incomplete, metric 0, localpref 100, valid, internal, best, group-best
Received Path ID 0, Local Path ID 0, version 12
RP/0/0/CPU0:ios#
RP/0/0/CPU0:ios#show route ipv6 2000::3/128
Thu Sep 17 09:45:25.967 UTC
Routing entry for 2000::3/128
Known via "bgp 132203", distance 200, metric 0, type internal
Installed Sep 17 04:05:36.583 for 05:39:49
Routing Descriptor Blocks
::ffff:10.100.0.3, from ::ffff:10.100.0.3
Nexthop in Vrf: "default", Table: "default", IPv4 Unicast, Table Id: 0xe0000000
Route metric is 0
No advertising protos.
RP/0/0/CPU0:ios#
RP/0/0/CPU0:ios#show cef 10.100.0.3
Thu Sep 17 09:46:29.312 UTC
10.100.0.3/32, version 86, internal 0x1000001 0x0 (ptr 0xa1455b74) [1], 0x0 (0xa143b3b0), 0xa28 (0xa183807c)
Updated Sep 17 01:47:42.680
local adjacency 10.100.4.6
Prefix Len 32, traffic index 0, precedence n/a, priority 3
via 10.100.4.6/32, GigabitEthernet0/0/0/1, 5 dependencies, weight 0, class 0 [flags 0x0]
path-idx 0 NHID 0x0 [0xa0f3d3f4 0x0]
next hop 10.100.4.6/32
local adjacency
local label 24002 labels imposed {24002}
via 10.100.4.10/32, GigabitEthernet0/0/0/2, 5 dependencies, weight 0, class 0 [flags 0x0]
path-idx 1 NHID 0x0 [0xa0f3d4f0 0x0]
next hop 10.100.4.10/32
local adjacency
local label 24002 labels imposed {24001}
RP/0/0/CPU0:ios#show cef ipv6 2000::3/128 detail
Thu Sep 17 09:46:41.681 UTC
2000::3/128, version 11, internal 0x1000001 0x0 (ptr 0xa1303ff4) [1], 0x0 (0x0), 0x208 (0xa1513118)
Updated Sep 17 04:05:36.603
Prefix Len 128, traffic index 0, precedence n/a, priority 4
gateway array (0xa124dc6c) reference count 1, flags 0x4038, source rib (7), 0 backups
[1 type 1 flags 0x48441 (0xa152d320) ext 0x0 (0x0)]
LW-LDI[type=0, refc=0, ptr=0x0, sh-ldi=0x0]
gateway array update type-time 1 Sep 17 04:05:36.603
LDI Update time Sep 17 04:05:36.603
via ::ffff:10.100.0.3/128, 5 dependencies, recursive [flags 0x6000]
path-idx 0 NHID 0x0 [0xa1794050 0x0]
recursion-via-/128
next hop VRF - 'default', table - 0xe0000000
next hop ::ffff:10.100.0.3/128 via 24002/0/21
next hop 10.100.4.6/32 Gi0/0/0/1 labels imposed {24002 24007} <<<<<< 外层为LDP标签/内层为MP-BGP分配的
next hop 10.100.4.10/32 Gi0/0/0/2 labels imposed {24001 24007}
Load distribution: 0 (refcount 1)
Hash OK Interface Address
0 Y Unknown ::ffff:10.100.0.3:0
RP/0/0/CPU0:ios#
RP/0/0/CPU0:ios#
RP/0/0/CPU0:ios#traceroute 2000::3 source 2000::1
Thu Sep 17 09:48:12.945 UTC
Type escape sequence to abort.
Tracing the route to 2000::3
1 ::ffff:10.100.0.2 [MPLS: Labels 24002/24007 Exp 0] 9 msec 9 msec 9 msec
2 2000::3 9 msec 9 msec 9 msec
RP/0/0/CPU0:ios#
6vPE #
什么是 6vPE #
对比 6PE 来看， 6vPE 是为了解决 VPN 用户的连通性问题，涉及到 VPN 路由的传递。
配置 #
VRF Configuration #
RP/0/0/CPU0:ios#show run vrf GLOBAL
Thu Sep 17 09:56:10.322 UTC
vrf GLOBAL
address-family ipv6 unicast
import route-target
100:100
!
export route-target
100:100
!
!
!
RP/0/0/CPU0:ios#show run int gigabitEthernet 0/0/0/3
Thu Sep 17 09:59:44.148 UTC
interface GigabitEthernet0/0/0/3
vrf GLOBAL
ipv4 address 10.100.8.1 255.255.255.252
ipv6 address 2001::1/64
!
BGP VPNv6 Address Family #
router bgp 132203
nsr
bfd minimum-interval 500
bfd multiplier 3
bgp router-id 10.100.0.1
address-family vpnv6 unicast
!
neighbor 10.100.0.3
remote-as 132203
update-source Loopback0
address-family vpnv6 unicast
!
!
BGP IPv6 VRF address-family #
RP/0/0/CPU0:ios#show run router bgp 132203 vrf GLOBAL
Thu Sep 17 10:01:03.712 UTC
router bgp 132203
vrf GLOBAL
rd auto
address-family ipv6 unicast
!
neighbor 2001::2
remote-as 64512
address-family ipv6 unicast
route-policy pass-all in
route-policy pass-all out
!
!
连通性测试 #
//PE1
RP/0/0/CPU0:ios#show bgp vpnv6 unicast summary
Thu Sep 17 10:02:19.067 UTC
BGP router identifier 10.100.0.1, local AS number 132203
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0x0 RD version: 0
BGP main routing table version 30
BGP NSR Initial initsync version 1 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
BGP scan interval 60 secs
BGP is operating in STANDALONE mode.
Process RcvTblVer bRIB/RIB LabelVer ImportVer SendTblVer StandbyVer
Speaker 30 30 30 30 30 0
Neighbor Spk AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down St/PfxRcd
10.100.0.3 0 132203 505 506 30 0 0 05:56:47 1
RP/0/0/CPU0:ios#show bgp vpnv6 unicast
Thu Sep 17 10:02:21.597 UTC
BGP router identifier 10.100.0.1, local AS number 132203
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0x0 RD version: 0
BGP main routing table version 30
BGP NSR Initial initsync version 1 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
BGP scan interval 60 secs
Status codes: s suppressed, d damped, h history, * valid, > best
i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 10.100.0.1:0 (default for vrf GLOBAL)
*> 2011::1/128 2001::2 0 0 64512 i
*>i2013::1/128 10.100.0.3 0 100 0 64513 i
Route Distinguisher: 10.100.0.3:0
*>i2013::1/128 10.100.0.3 0 100 0 64513 i
Processed 3 prefixes, 3 paths
RP/0/0/CPU0:ios#show bgp vpnv6 unicast rd 10.100.0.3:0 2013::1/128 detail
Thu Sep 17 10:02:31.756 UTC
BGP routing table entry for 2013::1/128, Route Distinguisher: 10.100.0.3:0
Versions:
Process bRIB/RIB SendTblVer
Speaker 29 29
Flags: 0x00040001+0x00000200;
Last Modified: Sep 17 04:05:36.288 for 05:56:55
Paths: (1 available, best #1)
Not advertised to any peer
Path #1: Received by speaker 0
Flags: 0x4000000025060005, import: 0x1f
Not advertised to any peer
64513
10.100.0.3 (metric 20000) from 10.100.0.3 (10.100.0.3)
Received Label 24008
Origin IGP, metric 0, localpref 100, valid, internal, best, group-best, import-candidate, not-in-vrf
Received Path ID 0, Local Path ID 0, version 29
Extended community: RT:100:100
RP/0/0/CPU0:ios#
RP/0/0/CPU0:ios#
RP/0/0/CPU0:ios#show route vrf GLOBAL ipv6 2013::1/128
Thu Sep 17 10:02:53.335 UTC
Routing entry for 2013::1/128
Known via "bgp 132203", distance 200, metric 0
Tag 64513, type internal
Installed Sep 17 04:05:36.353 for 05:57:17
Routing Descriptor Blocks
::ffff:10.100.0.3, from ::ffff:10.100.0.3
Nexthop in Vrf: "default", Table: "default", IPv4 Unicast, Table Id: 0xe0000000
Route metric is 0
No advertising protos.
RP/0/0/CPU0:ios#
//CE1
RP/0/0/CPU0:ios#show bgp ipv6 unicast summary
Thu Sep 17 10:13:04.543 UTC
BGP router identifier 10.100.8.2, local AS number 64512
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0800000 RD version: 19
BGP main routing table version 19
BGP NSR Initial initsync version 2 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
BGP scan interval 60 secs
BGP is operating in STANDALONE mode.
Process RcvTblVer bRIB/RIB LabelVer ImportVer SendTblVer StandbyVer
Speaker 19 19 19 19 19 0
Neighbor Spk AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down St/PfxRcd
2001::1 0 132203 441 439 19 0 0 07:12:20 1
RP/0/0/CPU0:ios#show bgp ipv6 unicast
Thu Sep 17 10:13:07.483 UTC
BGP router identifier 10.100.8.2, local AS number 64512
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0800000 RD version: 19
BGP main routing table version 19
BGP NSR Initial initsync version 2 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
BGP scan interval 60 secs
Status codes: s suppressed, d damped, h history, * valid, > best
i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 2011::1/128 :: 0 32768 i
*> 2013::1/128 2001::1 0 132203 64513 i
Processed 2 prefixes, 2 paths
RP/0/0/CPU0:ios#
//CE
RP/0/0/CPU0:ios#traceroute 2013::1 source 2011::1
Thu Sep 17 10:13:53.710 UTC
Type escape sequence to abort.
Tracing the route to 2013::1
1 2001::1 9 msec 0 msec 0 msec
2 ::ffff:10.100.0.2 [MPLS: Labels 24002/24008 Exp 0] 19 msec 19 msec 29 msec
3 2003::1 [MPLS: Label 24008 Exp 0] 29 msec 29 msec 29 msec
4 2013::1 19 msec 29 msec 19 msec
RP/0/0/CPU0:ios#
相关文档 #
测试 TOPO/FULL CONFIG #
