Dit document bevat informatie over het configureren van het MP-EBGP (Multi Protocol Extended Border Gateway Protocol) in Cisco IOS-routers. MP-BGP is een uitgebreide BGP waarmee BGP routeringsinformatie voor meerdere netwerklaagprotocollen IPv6, VPNv4 en andere kan uitvoeren. Met MP-BGP kunt u een unicast-routingtopologie gebruiken die verschilt van een multicast-routingtopologie, waarmee u het netwerk en de bronnen kunt beheren.
Er zijn geen specifieke vereisten van toepassing op dit document.
Dit document is niet beperkt tot specifieke software- en hardware-versies.
De configuraties in dit document zijn gebaseerd op de Cisco 3700-routerreeks waarop Cisco IOS® Software Release 12.4 (15)T 13 wordt uitgevoerd.
In dit voorbeeld zijn de R1- en R3-routers geconfigureerd om in AS 5500 te zijn en iBGP te vormen. De R2-router is geconfigureerd voor AS 6500. De R1- en R2-routers communiceren met elkaar via MP-EBGP. Alle routers zijn geconfigureerd met loopback-adressen.
Opmerking: Gebruik de Command Lookup Tool (alleen voor geregistreerde klanten) voor meer informatie over de opdrachten die in dit document worden gebruikt.
Het netwerk in dit document is als volgt opgebouwd:
Dit document gebruikt de volgende configuraties:
Configuratie op router R1 |
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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 |
Configuratie op router R2 |
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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 |
Configuratie op router R3 |
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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 |
Als u items in de (BGP) routeringstabel wilt weergeven, gebruikt u de opdracht ip bgp tonen.
Toon IP BGP |
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In router R1 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 192.168.100.11In router R3 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 |
Gebruik in router R2 de opdracht show ip bgp vpnv4 om adresinformatie (VPNv4) uit de (BGP)-tabel weer te geven.
Toon IP BGP VPNV4 |
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In router R2 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 |
MP-EBGP wordt vastgesteld tussen de R1- en R2-routers. Gebruik de ping-opdracht om de bereikbaarheid van R1 naar R2 te controleren en vice versa.
pingen |
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In router R1 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.In router R2 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. |
Revisie | Publicatiedatum | Opmerkingen |
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1.0 |
23-May-2012
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Eerste vrijgave |