使用PVP在Cisco Catalyst 8540 MSR增强型ARM(ARM 2)上配置MPLS
目录
简介
本文档提供Catalyst 8540增强型ATM路由器模块(ARM)上多协议层交换(MPLS)的示例配置。 ARM模块的主要功能是提高连接两个不同世界的能力 — 分组/交换（基于帧）和ATM（基于信元）。 此功能也可扩展到MPLS。具有增强型ARM的Catalyst 8540 MSR可安装在基于数据包和信元的网络边缘，在同一机箱中启用两种MPLS模式。Catalyst 8540 MSR上的增强型ARM(ARM2)是ATM接口上标签边缘路由(LER)功能所必需的 — 它充当标签交换路径(LSP)中每个传入和传出ATM接口的代理接口，以执行MPLS数据包处理。Catalyst 8540非常适合信元模式到帧模式MPLS集成（通过部署增强型ATM路由器模块实现）。 单个机箱最多可使用两个ARM2卡。
本文档提供了解释ARM 2用法的两种不同配置的示例。
- 将增强型ARM用于信元模式（在ARM 2上终止信元模式MPLS）
- 使用增强型ARM，通过ATM VP隧道实现帧模式MPLS。
先决条件
要求
本文档没有任何特定的要求。
使用的组件
本文档中的信息基于以下软件和硬件版本：
- 两个Cisco C8540 MSR，Cisco IOS® 12.1(10)EY版(256 MB DRAM)
- 思科C8510 MSR，思科IOS版本12.1(7a)EY1(64 MB DRAM)
- C8540-ARM2（增强型ATM路由器模块）
- WAI-OC3-4MM（4端口OC-3线卡）
- C85MS-4F-OC12MM（4端口OC-12线卡）
本文档中的信息都是基于特定实验室环境中的设备创建的。本文档中使用的所有设备最初均采用原始（默认）配置。如果您是在真实网络上操作，请确保您在使用任何命令前已经了解其潜在影响。
配置
本部分提供有关如何配置本文档所述功能的信息。OSPF用作内部路由协议。
网络图
本文档使用此图中所示的网络设置：
上图用于以下场景：
- 将增强型ARM用于信元模式（在ARM 2上终止信元模式MPLS）
- 使用增强型ARM，通过ATM VP隧道实现帧模式MPLS。
请注意，信元模式的配置使用路径C8540MSR-2到C8510MSR-3到C8540MSR-1，而本文档中描述的帧模式配置使用VP隧道连接C8540MSR-2和C8540MSR-2c8540MSR-1。
使用增强型ARM进行信元模式MPLS
在Catalyst 8540 MSR信元模式MPLS在所有ATM接口上受支持，并与ATM信令（如ILMI）和ATM路由(PNNI)并行工作。 当您添加mpls ip 接口命令(或旧版Cisco IOS中的tag-switching ip)并要求为每个转发等效类(FEC)或IP目标建立一个单向标签虚电路(LVC)或标记虚电路(TVC)时，将启用信元模式MPLS。标签虚电路在发起方LER称为头端LVC，在目的LER称为尾端LVC，在LSR称为中转LVC。在Cat8540 MSR充当纯ATM LSR(MPLS Lsr)的情况下p路由器),CPU不为ATM核心中学习的路由建立头端LVC。从CPU发往远程LSR的流量通过MPLS控制VC发送。ATM接口可以链接到ARM2端口，如果是，LVC将终止在ARM2端口上。实际上，当您将ATM接口链接到ARM2端口时，ARM2将充当ATM LER（MPLS PE路由器），并将为在ATM核心中学习的路由启动头端LVC（终止LVC）。
ATM接口、ATM VP和分层VP隧道可配置为在ARM2端口上终止（仅在8540 MSR平台上可用）。 为实现负载均衡，ATM接口可以链接到增强型ARM的两个端口中的任一个。要在ARM2端口上终止信元模式MPLS，请使用mpls-forwarding interface ATMx/y/z接口配置命令，其中ATMx/y/z是增强型ARM端口)。 该命令仅适用于主接口。
配置
C8540MSR-2(Catalyst 8540MSR)
C8540MSR-2#show hardware
C8540 named c8540MSR-2, Date: 04:46:41 UTC Mon Feb 10 2003
Slot Ctrlr-Type Part No. Rev Ser No Mfg Date RMA No. Hw Vrs Tst EEP
---- ------------ ---------- -- -------- --------- -------- ------- --- ---
0/* Super Cam 73-2739-03 B0 03170SXG Apr 27 99 0 3.0
0/1 155MM PAM 73-1496-03 A0 09006167 Aug 01 95 00-00-00 3.1 0 2
2/* OCM Board 73-2833-06 A0 03210XWB May 26 99 0 6.0
2/0 QUAD 622 Gen 73-2852-05 A0 03210YN8 May 26 99 0 5.0
9/* ETHERNET PAM 73-3754-05 A0 03374A9K Mar 17 99 0 4.1
12/* CMPM Card 73-3944-05 A0 04209EX0 Aug 29 00 0 5.0
12/0 ARM2 PAM 73-5533-01 A0 0424A160 Aug 29 00 0 5.1
12/1 ARM2 PAM 73-5533-01 A0 0424A183 Aug 29 00 0 5.1
C8540MSR-2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
C8540MSR-2(config)#int atm 0/1/2
C8540MSR-2(config-if)#mpls ip
! Cell mode MPLS enabled
C8540MSR-2(config-if)#ip add 10.254.14.237 255.255.255.252
C8540MSR-2(config-if)#mpls label protocol ldp
! LDP enabled on the interface
C8540MSR-2(config-if)#end
C8540MSR-2#show atm vc int atm 0/1/2
Interface VPI VCI Type X-Interface X-VPI X-VCI Encap Status
ATM0/1/2 0 5 PVC ATM0 0 57 QSAAL UP
ATM0/1/2 0 16 PVC ATM0 0 37 ILMI UP
ATM0/1/2 0 18 PVC ATM0 0 202 PNNI UP
ATM0/1/2 0 32 PVC ATM0 0 256 SNAP UP
C8540MSR-2#show mpls int atm 0/1/2
Interface IP Tunnel Operational
ATM0/1/2 Yes (ldp) No Yes (ATM labels)
C8540MSR-2#show mpls int atm 0/1/2 det
Interface ATM0/1/2:
IP labeling enabled (ldp)
LSP Tunnel labeling not enabled
MPLS operational
MTU = 4470
ATM tagging: Label VPI = 1
Label VCI range = 33 - 65535
Control VC = 0/32
C8540MSR-2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
C8540MSR-2(config)#int atm 0/1/2
C8540MSR-2(config-if)#mpls-forwarding int atm 12/0/1
! Terminate Cell mode MPLS on ARM2
C8540MSR-2(config-if)#end
C8540MSR-2#show atm vc int atm 0/1/2
Interface VPI VCI Type X-Interface X-VPI X-VCI Encap Status
ATM0/1/2 0 5 PVC ATM0 0 57 QSAAL UP
ATM0/1/2 0 16 PVC ATM0 0 37 ILMI UP
ATM0/1/2 0 18 PVC ATM0 0 202 PNNI UP
ATM0/1/2 0 32 PVC ATM12/0/1 2 120 SNAP UP
ATM0/1/2 1 35 TVC(O) ATM12/0/1 2 121 MUX UP
ATM0/1/2 1 36 TVC(O) ATM12/0/1 2 122 MUX UP
ATM0/1/2 1 37 TVC(O) ATM12/0/1 2 123 MUX UP
ATM0/1/2 1 41 TVC(O) ATM12/0/1 2 124 MUX UP
C8540MSR-2#show mpls int
Interface IP Tunnel Operational
FastEthernet9/0/0 Yes (ldp) No Yes
ATM0/1/2 Yes (ldp) No Yes (ATM labels)
! Note: ATM labels -> Cell mode
ATM12/0/0.60 Yes(ldp) No Yes
C8510MSR-3(Catalyst 8510MSR)
C8510MSR-1#show running-config
Building configuration...
! interface Loopback0
ip address 10.254.231.1 255.255.255.255
! interface ATM0/0/2
ip address 10.254.14.245 255.255.255.252
logging event subif-link-status
no atm ilmi-keepalive
mpls label protocol ldp
tag-switching ip
!
interface ATM0/0/3
ip address 10.254.14.238 255.255.255.252
logging event subif-link-status
load-interval 30
no atm ilmi-keepalive
mpls label protocol ldp
tag-switching ip
!
router ospf 1
log-adjacency-changes
network 10.0.0.0 0.255.255.255 area 0.0.0.0
使用增强型ARM实现ATM VP隧道上的帧模式MPLS
带有增强型ARM线卡的Catalyst 8540 MSR还可以在ATM上运行帧模式MPLS。为了说明增强型ARM在帧模式MPLS中的使用，请查看本文档中的“在ATM隧道上使用增强型ARM for Frame Mode MPLS”配置示例。ATM VP隧道有时用于连接两个站点。可以使用大型“管道”VP隧道，而不是配置单个VC。为了说明此选项（通常需要在远程站点之间使用大量虚电路的公司使用），在C8540MSR-1和C8540MSR-2之间创建了VP隧道。两个8540MSR直接通过ATM2/0/0(OC)连接–12，已使用分层VP隧道ATM2/0/0.60)。 两个增强型ARM模块在ATM子接口上运行帧模式MPLS。因此，已配置数据PVC/aal5snap。
此示例显示在C8540MSR-1中为在ATM VP隧道上配置帧模式MPLS的增强型ARM所执行的步骤。
C8540MSR-1(Catalyst 8540MSR)
C8540MSR-1#show hardware
C8540 named c8540-r6-1, Date: 04:46:41 UTC Mon Feb 10 2003
Slot Ctrlr-Type Part No. Rev Ser No Mfg Date RMA No. Hw Vrs Tst EEP
---- ------------ ---------- -- -------- --------- -------- ------- --- ---
0/* Super Cam 73-2739-03 B0 03170SUQ Apr 27 99 0 3.0
0/1 155MM PAM 73-1496-03 A6 03199939 Aug 01 95 00-00-00 3.1 0 2
2/* OCM Board 73-2833-06 A0 03210XWB May 26 99 0 6.0
2/0 QUAD 622 Gen 73-2852-05 A0 03210YN8 May 26 99 0 5.0
9/* ETHERNET PAM 73-3754-05 A0 031111EO Mar 17 99 0 4.1
11/* CMPM Card 73-3944-05 A0 04209F5E Aug 29 00 0 5.0
11/0 ARM2 PAM 73-5533-01 A0 0424A162 Aug 29 00 0 5.1
11/1 ARM2 PAM 73-5533-01 A0 0424A17C Aug 29 00 0 5.1
C8540MSR-1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
C8540MSR-1(config)#atm hierarchical-tunnel
C8540MSR-1(config)#atm connection-traffic-table-row index 60 cbr pbr 120000
C8540MSR-1(config)#int atm 2/0/0
C8540MSR-1(config-if)#atm pvp 6 hierarchical rx-cttr 60 tx-cttr 60
C8540MSR-1(config-if)#int atm 2/0/0.60
C8540MSR-1(config-subif)#exit
C8540MSR-1(config)#int atm 11/0/0.60 point-to-point
C8540MSR-1(config-subif)#ip address 10.254.14.10 255.255.255.252
C8540MSR-1(conf-sif)#atm pvc 2 60 pd on encap aal5snap int atm 2/0/0.60 60 60
C8540MSR-1(config-subif)#mpls label protocol ldp
C8540MSR-1(config-subif)#mpls ip
C8540MSR-1(config-subif)#end
C8540MSR-1#show atm vc int atm 11/0/0.60 | include ATM2/
ATM11/0/0 2 60 PVC ATM2/0/0.60 60 60 SNAP UP
C8540MSR-1#show mpls int
Interface IP Tunnel Operational
ATM0/0/1 Yes (ldp) No Yes (ATM labels)
ATM0/0/2 Yes No No (ATM labels)
FastEthernet9/0/4 Yes No No
ATM0/1/0 Yes (ldp) No No (ATM labels)
ATM11/0/1 Yes No No
ATM11/0/0.5 Yes (tdp) No Yes
ATM11/0/0.60 Yes (ldp) No Yes
! Note: no ATM labels -> Frame mode
C8540MSR-1#show mpls int atm 11/0/0.60 det
Interface ATM11/0/0.60:
IP labeling enabled (ldp) LSP Tunnel labeling not enabled
MPLS operational MTU = 4470
C8540MSR-1#show atm vp
Interface VPI Type X-Interface X-VPI Status
ATM2/0/0 60 PVP HIE. TUNNEL
配置
网络图中MSR配置的相关部分如下所示：
- C8540MSR-2
- C8540MSR-1
- C8510MSR-3(此配置与使用增强型ARM进行信元模式MPLS的配置相同。)
C8540MSR-2(Catalyst 8540MSR)
C8540MSR-2#show running-config
Building configuration...
!
mpls label protocol ldp
atm hierarchical-tunnel
atm connection-traffic-table-row index 60 cbr pcr 120000
!
interface Loopback0 ip address 10.254.225.1 255.255.255.255
!
interface ATM0/1/2
description IP subnet 10.254.14.236
ip address 10.254.14.237 255.255.255.252
ip ospf cost 4
no atm ilmi-keepalive
mpls label protocol ldp
tag-switching ip
mpls-forwarding interface ATM12/0/1
! terminates cell mode MPLS on the ARM module
interface ATM2/0/0
no ip address
no atm ilmi-keepalive
atm pvp 60 hierarchical rx-cttr 60 tx-cttr 60
!
interface ATM2/0/0.60 point-to-point
description Hierarchical VP Tunnel for frame mode MPLS over ATM
!
interface FastEthernet9/0/0
ip address 10.64.0.2 255.255.255.252
load-interval 30
duplex full
speed 100
tag-switching ip
mpls-forwarding interface ATM12/0/0
! EPIF based FE line cards do not support MPLS natively
! link to ARM2 (ATM 12/0/0) enables MPLS on those cards
interface ATM12/0/0
description Enhanced ARM - ARM2
no ip address
!
interface ATM12/0/0.60 point-to-point
description ARM2 subinterface used for Frame mode MPLS over HVPT 60
ip address 10.254.14.9 255.255.255.252
atm pvc 2 60 pd on encap
al5snap interface ATM2/0/0.60 60 60
mpls label protocol ldp tag-switching ip
! an ARM2 point-to-point subinterface (point-to-point) supported as of
! Cisco IOS release 12.1(10)EY only
! router ospf 1
router-id 10.254.225.1
log-adjacency-changes network 10.0.0.0 0.255.255.255 area 0.0.0.0
!
C8540MSR-1(Catalyst 8540MSR)
C8540MSR-1#show running-config Building configuration... sdm sram Label 32768 sdm sram Tag-Cos 32768
! tag-switching tdp router-id Loopback0 ! atm hierarchical-tunnel atm connection-traffic-table-row index 60 cbr pcr 120000 ! interface Loopback0 ip address 10.254.232.1 255.255.255.255 ! interface ATM0/1/0 ip address 10.254.14.246 255.255.255.252 ip ospf cost 100 logging event subif-link-status no atm ilmi-keepalive mpls label protocol ldp tag-switching ip mpls-forwarding interface ATM11/0/0 ! interface ATM2/0/0 no ip address no atm ilmi-keepalive atm pvp 60 hierarchical rx-cttr 60 tx-cttr 60 ! interface ATM2/0/0.60 point-to-point no atm ilmi-keepalive ! interface FastEthernet9/0/4 ip address 10.177.1.1 255.255.255.252 tag-switching ip mpls-forwarding interface ATM11/0/0 ! interface ATM11/0/0 no ip address ! interface ATM11/0/0.60 point-to-point ip address 10.254.14.10 255.255.255.252 atm pvc 2 60 pd on encap aal5snap interface ATM2/0/0.60 60 60 mpls label protocol ldp tag-switching ip ! router ospf 1 router-id 10.254.232.1 log-adjacency-changes network 10.177.1.0 0.0.0.3 area 0.0.0.0 network 10.254.0.0 0.0.255.255 area 0.0.0.0 ! end
验证
使用以下命令验证MPLS是否正常运行：
- show mpls interfaces [detail] — 验证标签分发协议是否在请求的接口上运行
- show mpls ldp neighbors — 显示LDP会话/邻居连接的状态
- show mpls ldp discovery — 确定接口的LDP标识符和LDP hello交换状态
- show mpls forwarding-table -检查MPLS转发信息库(FIB)表
- show mpls ip binding -检查MPLS IP标签信息库(LIB)表
C8540MSR-1#show mpls interfaces Interface IP Tunnel Operational ATM0/0/1 Yes (ldp) No Yes (ATM labels) ATM0/1/0 Yes (ldp) No Yes (ATM labels) ATM11/0/0.60 Yes (ldp) No Yes
C8540MSR-1#show mpls interfaces atm 0/1/0 detail Interface ATM0/1/0: IP labeling enabled (ldp) LSP Tunnel labeling not enabled MPLS operational MTU = 4470 ATM tagging: Label VPI = 1 Label VCI range = 33 - 65535 Control VC = 0/32
C8540MSR-1#show mpls ldp neighbor Peer LDP Ident: 10.254.225.1:0; Local LDP Ident 10.254.232.1:0 TCP connection: 10.254.225.1.646 - 10.254.232.1.11016 State: Oper; Msgs sent/rcvd: 106/93; Downstream Up time: 00:56:36 LDP discovery sources: ATM11/0/0.60, Src IP addr: 10.254.14.9 Addresses bound to peer LDP Ident: 2.2.2.1 10.64.4.190 10.254.225.1 1.254.8.1
10.254.14.221 10.254.14.225 10.254.14.237 10.254.14.9 Peer LDP Ident: 10.254.231.1:4; Local LDP Ident 10.254.232.1:2 TCP connection: 10.254.14.245.646 - 10.254.14.246.11017 State: Oper; Msgs sent/rcvd: 45/45; Downstream on demand Up time: 00:38:27 LDP discovery sources: ATM0/1/0, Src IP addr: 10.254.14.245
C8540MSR-1#show mpls ldp discovery Local LDP Identifier: 10.254.232.1:0 Discovery Sources: Interfaces: ATM0/1/0 (ldp): xmit/recv LDP Id: 10.254.231.1:4; IP addr: 10.254.14.245 ATM11/0/0.60 (ldp): xmit/recv LDP Id: 10.254.225.1:0
C8540MSR-1#show mpls forwarding-table Local Outgoing Prefix Bytes tag Outgoing Next Hop tag tag or VC or Tunnel Id switched interface 16 Untagged 10.254.14.220/30 0 AT11/0/0.60 point2point 17 27 10.254.247.1/32 0 AT11/0/0.60 point2point 20 22 10.254.14.240/30 0 AT11/0/0.60 point2point 21 26 10.254.231.1/32 0 AT11/0/0.60 point2point 24 Untagged 10.254.14.224/30 0 AT11/0/0.60 point2point 25 24 10.254.227.1/32 0 AT11/0/0.60 point2point 26 Pop tag 10.254.14.236/30 0 AT11/0/0.60 point2point 33 Untagged 10.254.221.1/32 0 AT11/0/0.60 point2point 45 18 10.254.14.12/30 0 AT11/0/0.60 point2point
SORBRCV0(c8540-r6-1)#show mpls ip bind ... 10.254.221.1/32 in label: 33 10.254.222.1/32 in label: 36 out vc label: 1/53 lsr: 10.254.233.1:2 ATM0/0/1 Active ingress 4 hops (vcd 49) 10.254.223.1/32 in label: 34 out vc label: 1/54 lsr: 10.254.233.1:2 ATM0/0/1 Active ingress 3 hops (vcd 43) 10.254.225.1/32 in label: 28 out label: imp-null lsr: 10.254.225.1:0 10.254.227.1/32 in label: 25 out label: 24 lsr: 10.254.225.1:0 10.254.232.1/32 in label: imp-null in vc label: 1/34 lsr: 10.254.233.1:2 ATM0/0/1 Active egress (vcd 59) out label: 33 lsr: 10.254.225.1:0 10.254.233.1/32 in label: 29 out label: 34 lsr: 10.254.225.1:0 out vc label: 1/60 lsr: 10.254.233.1:2 ATM0/0/1 Active ingress 2 hops (vcd 38) 10.254.242.1/32 in label: 19 out vc label: 1/61 lsr: 10.254.233.1:2 ATM0/0/1 Active ingress 5 hops (vcd 50) 10.254.247.1/32 in label: 17 out label: 27 lsr: 10.254.225.1:0
故障排除
有关MPLS故障排除的其他信息，请参阅MPLS故障排除一般故障排除文档，该文档详细解释了MPLS故障排除。
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