本文档介绍如何在Cisco IOS路由器中配置多协议扩展边界网关协议(MP-EBGP)。MP-BGP是一种扩展BGP,允许BGP为多个网络层协议IPv6、VPNv4等传输路由信息。MP-BGP允许您使用不同于组播路由拓扑的单播路由拓扑,这有助于控制网络和资源。
本文档没有任何特定的要求。
本文档不限于特定的软件和硬件版本。
本文档中的配置基于运行Cisco IOS®软件版本12.4(15)T 13的Cisco 3700系列路由器。
有关文档规则的详细信息,请参阅 Cisco 技术提示规则。
在本例中,R1和R3路由器配置为位于AS 5500中,形成iBGP。R2路由器配置为AS 6500。R1和R2路由器使用MP-EBGP相互通信。所有路由器都配置了环回地址。
注意:使用命令查找工具(仅限注册客户)可查找有关本文档中使用的命令的详细信息。
本文档使用以下网络设置:
本文档使用以下配置:
路由器R1上的配置 |
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R1#show run Building configuration... ! version 12.4 ! hostname R1 ! ip cef ! ! interface Loopback0 ip address 10.10.10.10 255.255.255.0 ! interface FastEthernet0/0 ip address 192.168.100.10 255.255.255.0 duplex auto speed auto ! interface Serial0/0 ip address 172.16.10.1 255.255.255.0 mpls ip clock rate 2000000 ! router bgp 5500 no synchronization bgp router-id 10.10.10.10 bgp log-neighbor-changes network 192.168.100.0 redistribute connected neighbor 172.16.10.2 remote-as 6500 neighbor 172.16.10.2 soft-reconfiguration inbound neighbor 192.168.100.11 remote-as 5500 no auto-summary ! address-family vpnv4 neighbor 172.16.10.2 activate neighbor 172.16.10.2 send-community both !--- Sends the community attribute to a BGP neighbor. exit-address-family ! ! end |
路由器R2上的配置 |
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R2#show run Building configuration... ! version 12.4 ! hostname R2 ! ip cef ! ip vrf WAN rd 2020:1 route-target export 2020:1 route-target import 2020:1 ! ! interface Loopback0 ip vrf forwarding WAN !--- Associates a VRF instance with an interface or subinterface. ip address 20.20.20.20 255.255.255.255 ! interface Serial0/0 ip vrf forwarding WAN ip address 172.16.10.2 255.255.255.0 mpls ip clock rate 2000000 ! router bgp 6500 no synchronization bgp router-id 20.20.20.20 bgp log-neighbor-changes neighbor 172.16.10.1 remote-as 5500 no auto-summary ! ! address-family vpnv4 neighbor 172.16.10.1 activate neighbor 172.16.10.1 send-community both exit-address-family ! address-family ipv4 vrf WAN redistribute connected redistribute static neighbor 172.16.10.1 remote-as 5500 neighbor 172.16.10.1 activate no synchronization exit-address-family ! ! ! end |
路由器R3上的配置 |
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R3#show run Building configuration... ! version 12.4 ! hostname R3 ! ip cef ! ! ! interface Loopback0 ip address 11.11.11.11 255.255.255.255 ! interface FastEthernet0/0 ip address 192.168.100.11 255.255.255.0 duplex auto speed auto ! router bgp 5500 no synchronization bgp router-id 11.11.11.11 bgp log-neighbor-changes neighbor 192.168.100.10 remote-as 5500 no auto-summary ! end |
要显示(BGP)路由表中的条目,请使用show ip bgp命令。
show ip bgp |
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在路由器 R1 中 R1#show ip bgp 172.16.10.2 BGP routing table entry for 172.16.10.2/32, version 14 Paths: (1 available, best #1, table Default-IP-Routing-Table) Advertised to update-groups: 1 2 Local 0.0.0.0 from 0.0.0.0 (10.10.10.10) Origin incomplete, metric 0, localpref 100, weight 32768, valid, sourced, best !--- Displays the routing table entries for the host 172.16.10.2 R1#sh ip bgp 192.168.100.11 BGP routing table entry for 192.168.100.0/24, version 4 Paths: (1 available, best #1, table Default-IP-Routing-Table) Advertised to update-groups: 1 2 Local 0.0.0.0 from 0.0.0.0 (10.10.10.10) Origin IGP, metric 0, localpref 100, weight 32768, valid, sourced, local, best !--- Displays the entries for the host 192.168.100.11在路由器 R3 中 R3#sh ip bgp 192.168.100.10 BGP routing table entry for 192.168.100.0/24, version 4 Paths: (1 available, best #1, table Default-IP-Routing-Table, RIB-failure(17)) Not advertised to any peer Local 192.168.100.10 from 192.168.100.10 (10.10.10.10) Origin IGP, metric 0, localpref 100, valid, internal, best !--- Displays the entries for the host 192.168.100.10 |
在路由器R2中,使用show ip bgp vpnv4命令显示(BGP)表中的(VPNv4)地址信息。
show ip bgp vpnv4 |
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在路由器 R2 中 R2#sh ip bgp vpnv4 vrf WAN BGP table version is 24, local router ID is 20.20.20.20 Status codes: s suppressed, d damped, h history, * valid, > best, I - internal, r RIB-failure, S Stale Origin codes: I - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path Route Distinguisher: 2020:1 (default for vrf WAN) *> 10.10.10.0/24 172.16.10.1 0 0 5500 ? *> 20.20.20.20/32 0.0.0.0 0 32768 ? * 172.16.10.0/24 172.16.10.1 0 0 5500 ? *> 0.0.0.0 0 32768 ? r> 172.16.10.2/32 172.16.10.1 0 0 5500 ? *> 192.168.100.0 172.16.10.1 0 0 5500 I !--- Displays prefixes associated with the (VRF) instance WAN. R2#show ip bgp vpnv4 vrf WAN 172.16.10.1 BGP routing table entry for 2020:1:172.16.10.0/24, version 7 Paths: (2 available, best #2, table WAN) Advertised to update-groups: 1 5500 172.16.10.1 from 172.16.10.1 (10.10.10.10) Origin incomplete, metric 0, localpref 100, valid, external Extended Community: RT:2020:1 mpls labels in/out 18/nolabel Local 0.0.0.0 from 0.0.0.0 (20.20.20.20) Origin incomplete, metric 0, localpref 100, weight 32768, valid, sourced, best Extended Community: RT:2020:1 mpls labels in/out 18/aggregate(WAN) !--- Displays prefixes associated with neighbor 172.16.10.1 |
在R1和R2路由器之间建立MP-EBGP。使用ping命令检验从R1到R2的可达性,反之亦然。
ping |
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在路由器 R1 中 R1#ping 172.16.10.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.10.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 12/64/208 ms R1#ping 192.168.100.11 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.100.11, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 12/41/96 ms !--- Router R1 can successfully ping the routers R2 and R3.在路由器 R2 中 R2#ping vrf WAN 172.16.10.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.10.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 4/32/96 ms R2#ping vrf WAN 192.168.100.11 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.100.11, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 32/73/204 ms !--- Router R2 can successfully reach router R1 and R3. |
版本 | 发布日期 | 备注 |
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1.0 |
23-May-2012 |
初始版本 |