Network Requirements
- Set up OSPFv3 neighbors between Device1 and Device3, and configure Device3 to advertise routes 2002:1::/64 and 2002:2::/64 to Device1.
- Set up EBGP neighbors between Device1 and Device2.
- On Device1, aggregate routes 2002:1::/64 and 2002:2::/64 into route 2002::/30 and advertise the aggregated route to Device2.
Network Topology
Figure 13–5 Networking for configuring IPv6 BGP route summary
Configuration Steps
Step 1: Configure the IPv6 global unicast addresses of the interfaces. (Omitted)
Step 2: Configure OSPFv3 so that Device1 can learn the two routes 2002:1:/64 and 2002:2::/64 advertised by Device3.
#Configure Device1.
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Device1#configure terminal
Device1(config)#ipv6 router ospf 100
Device1(config-ospf6)#router-id 1.1.1.1
Device1(config-ospf6)#exit
Device1(config)#interface vlan 2
Device1(config-if-vlan2)#ipv6 router ospf 100 area 0
Device1(config-if-vlan2)#exit
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#Configure Device3.
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Device3#configure terminal
Device3(config)#ipv6 router ospf 100
Device3(config-ospf6)#router-id 3.3.3.3
Device3(config-ospf6)#exit
Device3(config)#interface vlan 2
Device3(config-if-vlan2)#ipv6 router ospf 100 area 0
Device3(config-if-vlan2)#exit
Device3(config)#interface vlan3
Device3(config-if-vlan3)#ipv6 router ospf 100 area 0
Device3(config-if-vlan3)#exit
Device3(config)#interface gigabitethernet 0/2/2
Device3(config-if-gigabitethernet0/2/2)#ipv6 router ospf 100 area 0
Device3(config-if-gigabitethernet0/2/2)#exit
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#View the route table of Device1.
Device1#show ipv6 route
Codes: C - Connected, L - Local, S - static, R - RIP, B - BGP, i-ISIS
U - Per-user Static route
O - OSPF, OE-OSPF External, M - Management
L ::1/128 [0/0]
via ::, 1w2d:07:35:38, lo0
C 2001:1::/64 [0/0]
via ::, 00:01:11, vlan2
L 2001:1::2/128 [0/0]
via ::, 00:01:10, lo0
C 2001:2::/64 [0/0]
via ::, 00:01:06, vlan3
L 2001:2::2/128 [0/0]
via ::, 00:01:04, lo0
O 2002:1::/64 [110/2]
via fe80::201:7aff:fe62:bb7e, 00:01:54, vlan2
O 2002:2::/64 [110/2]
via fe80::201:7aff:fe62:bb7e, 00:01:54, vlan2
According to the route table, Device1 has learnt routes 2002:1:1::/64 and 2002:1:2::/64 advertised by Device3.
Step 3: Configure the IPv6 BGP basic functions.
#Configure Device1.
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Device1(config)#router bgp 100
Device1(config-bgp)#bgp router-id 1.1.1.1
Device1(config-bgp)#address-family ipv6
Device1(config-bgp-af)#neighbor 2001:2::1 remote-as 200
Device1(config-bgp-af)#exit-address-family
Device1(config-bgp)#exit
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#Configure Device2.
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Device2#configure terminal
Device2(config)#router bgp 200
Device2(config-bgp)#bgp router-id 2.2.2.2
Device2(config-bgp)#address-family ipv6
Device2(config-bgp-af)#neighbor 2001:2::2 remote-as 100
Device2(config-bgp-af)#exit-address-family
Device2(config-bgp)#exit
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#On Device1, check the IPv6 BGP neighbor status.
Device1#show bgp ipv6 unicast summary
BGP router identifier 1.1.1.1, local AS number 100 BGP table version is 1
1 BGP AS-PATH entries 0 BGP community entries
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
2001:2::1 4 200 3 3 1 0 0 00:01:16 0
IPv6 BGP neighbors have been successfully set up between Device1 and Device2.
Step 4: Configure IPv6 BGP route summary.
Two solutions are available to complete the network requirements.
Solution 1: Configure an IPv6 static route that is targeted at null0 to introduce the the static route to BGP.
#Configure Device1.
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Device1(config)#ipv6 route 2002::/30 null 0
Device1(config)#router bgp 100
Device1(config-bgp)#address-family ipv6
Device1(config-bgp-af)#network 2002::/30
Device1(config-bgp-af)#exit-address-family
Device1(config-bgp)#exit
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Check the result.
#View the IPv6 BGP route table of Device1.
Device1#show bgp ipv6 unicast
BGP table version is 2, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
[B]*> 2002::/30 :: 0 32768 i
You can see that the aggregated route 2001::/16 is generated in the IPv6 BGP route table of Device1.
#View the route table of Device2.
Device2#show bgp ipv6 unicast
BGP table version is 2, local router ID is 2.2.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
[B]*> 2002::/30 2001:2::2 0 0 100 i
Device2#show ipv6 route
Codes: C - Connected, L - Local, S - static, R - RIP, B - BGP, i-ISIS
U - Per-user Static route
O - OSPF, OE-OSPF External, M - Management
L ::1/128 [0/0]
via ::, 1w6d:03:14:01, lo0
C 2001:2::/64 [0/0]
via ::, 01:20:21, vlan3
L 2001:2::1/128 [0/0]
via ::, 01:20:20, lo0
B 2002::/30 [20/0]
via 2001:2::2, 00:00:44, vlan3
Device2 has successfully learnt the aggregated route 2002::/30 that has been advertised by Device1.
Solution 2: First introduce detailed routes into BGP, and then run the aggregate-address command to aggregate the routes.
#Configure Device1.
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Device1(config)#router bgp 100
Device1(config-bgp)#address-family ipv6
Device1(config-bgp-af)#redistribute ospf 100
Device1(config-bgp-af)#aggregate-address 2002::/30 summary-only
Device1(config-bgp-af)#exit-address-family
Device1(config-bgp)#exit
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Check the result.
#Query the IPv6 BGP route table of Device1.
Device1#show bgp ipv6 unicast
BGP table version is 4, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
[O]*> 2001:1::/64 :: 1 32768 ?
[B]*> 2002::/30 :: 32768 i
[O]s> 2002:1::/64 :: 2 32768 ?
[O]s> 2002:2::/64 :: 2 32768 ?
The aggregated route 2002::/30 has been generated in the IPv6 BGP route table of Device1.
#View the route table of Device2.
Device2#show bgp ipv6 unicast
BGP table version is 4, local router ID is 2.2.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
[B]*> 2001:1::/64 2001:2::2 1 0 100 ?
[B]*> 2002::/30 2001:2::2 0 0 100 i
Device2#show ipv6 route
Codes: C - Connected, L - Local, S - static, R - RIP, B - BGP, i-ISIS
U - Per-user Static route
O - OSPF, OE-OSPF External, M - Management
L ::1/128 [0/0]
via ::, 1w6d:03:16:42, lo0
B 2001:1::/64 [20/0]
via 2001:2::2, 00:00:50, vlan2
C 2001:2::/64 [0/0]
via ::, 01:23:01, vlan2
L 2001:2::1/128 [0/0]
via ::, 01:23:00, lo0
B 2002::/30 [20/0]
via 2001:2::2, 00:00:50, vlan2
Device2 has successfully learnt the aggregated route 2002::/30 that has been advertised by Device1.
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When the aggregate-address command is used to aggregate routes, if the extended command summary-only is configured, the device advertises only the aggregated route; otherwise, both common routes and aggregated routes are advertised.
Switch
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