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IPv6 - BGP Dual stack

Posted Aug 15, 2013
By Jonas Collén
6 min read

Dags för ett inlägg om implementering av BGP i IPv6. Detta ingår dock ej i CCIEs Blueprint så finns väl egentligen ingen anledning lära sig detta, men tycker ändå det var intressant så vi kör på.. :)

ipv6-bgp

Tänkte göra ett försök att konfigurera IPv6-dualstack i ovanstående topologi som vi använde i inlägget om iBGP & Transitareas.

IPv4-stacken är redan konfat, R5 annonserar prefixet 5.5.5.0/24 och R6 annonserar 6.6.6.0/24, AS500 används endast som en transit-area,

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R5#sh ip bgp
BGP table version is 3, local router ID is 5.5.5.5
 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
 *> 5.5.5.0/24 0.0.0.0 0 32768 i
 *> 6.6.6.0/24 172.16.51.1 0 500 200 i
R6#sh ip bgp
 BGP table version is 3, local router ID is 6.6.6.6
 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
 *> 5.5.5.0/24 172.16.36.3 0 500 100 i
 *> 6.6.6.0/24 0.0.0.0 0 32768 i

Vi har full-mesh iBGP-peering inom AS500 och peerar mot Loopbacks & next-hop-self, För mer information om hur vi konfat upp detta se den tidigare posten om iBGP jag länkade till.

R5 - eBGP

Låt oss börja med R5:

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ipv6 unicast-routing
 ipv6 route 2001:DB8:CC1E:100::/64 Null0
int fa0/0
 ipv6 address FE80::5 link-local
 ipv6 address 2001:DB8:CC1E:51::5/64
router bgp 100
 bgp router-id 5.5.5.5
 neighbor 2001:DB8:CC1E:51::1 remote-as 500

So far inget nytt, dock behöver vi även aktivera IPv6-funktionalitet i BGP-processen och annonsera vårat prefix. Observera att vi gick in i den vanliga bgp-processen, till skillnad mot ex. OSPF/EIGRP där vi skriver “ipv6 router ospf n”.

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R5(config-router)#address-family ipv6
 R5(config-router-af)#neighbor 2001:DB8:CC1E:51::1 activate
 R5(config-router-af)#network 2001:DB8:CC1E:100::/64

R6 - eBGP ———

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ipv6 unicast-routing
 ipv6 route 2001:DB8:CC1E:200::/64 Null0
 !
 interface FastEthernet0/0
 ipv6 address FE80::6 link-local
 ipv6 address 2001:DB8:CC1E:36::6/64
 !
 router bgp 200
 bgp router-id 6.6.6.6
 neighbor 2001:DB8:CC1E:36::3 remote-as 500
 !
 address-family ipv6
 neighbor 2001:DB8:CC1E:36::3 activate
 network 2001:DB8:CC1E:200::/64

Transit-area ————

R1

Här har vi lite mer att konfigurera. R1s BGP-konfig ser just nu ut enligt följande:

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R1#sh run | sec bgp
 redistribute bgp 500
 router bgp 500
 no synchronization
 bgp log-neighbor-changes
 neighbor 2.2.2.2 remote-as 500
 neighbor 2.2.2.2 update-source Loopback0
 neighbor 2.2.2.2 next-hop-self
 neighbor 3.3.3.3 remote-as 500
 neighbor 3.3.3.3 update-source Loopback0
 neighbor 3.3.3.3 next-hop-self
 neighbor 4.4.4.4 remote-as 500
 neighbor 4.4.4.4 update-source Loopback0
 neighbor 4.4.4.4 next-hop-self
 neighbor 172.16.51.5 remote-as 100
 no auto-summary

Men med våra nyvunna BGP-kunskaper från tidigare inlägg kan vi väl ta och rensa upp detta lite först via peer-groups.

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router bgp 500
 neighbor iBGP peer-group
 neighbor iBGP remote-as 500
 neighbor iBGP update-source Loopback0
 neighbor iBGP next-hop-self
 neighbor 2.2.2.2 peer-group iBGP
 neighbor 3.3.3.3 peer-group iBGP
 neighbor 4.4.4.4 peer-group iBGP
 neighbor 172.16.51.5 remote-as 100
 no auto-summary

Grundkonfig:

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ipv6 unicast-routing
interface FastEthernet0/0
 ipv6 address FE80::1 link-local
 ipv6 address 2001:DB8:CC1E:51::1/64
interface Serial0/0
 ipv6 address FE80::1 link-local
 ipv6 address 2001:DB8:CC1E:12::1/64
 !
 interface Serial0/1
 ipv6 address FE80::1 link-local
 ipv6 address 2001:DB8:CC1E:14::1/64
 !
 interface Loopback0
 ipv6 address 2001:DB8:CC1E:1111::1/128

IGP:

För att kunna peera mot IPv6-loopback adresser måste vi även annonsera dessa nät över IGP, i detta fall använder i OSPF.

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interface Loopback0
 ipv6 ospf 100 area 0
 !
 interface Serial0/0
 ipv6 ospf 100 area 0
 !
 interface Serial0/1
 ipv6 ospf 100 area 0
 !
 interface FastEthernet0/0
 ipv6 ospf 100 area 0
 !
 ipv6 router ospf 100
 router-id 1.1.1.1

iBGP:

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router bgp 500
neighbor iBGP_ipv6 peer-group
 neighbor iBGP_ipv6 remote-as 500
 neighbor iBGP_ipv6 update-source Loopback0
 neighbor iBGP_ipv6 next-hop-self
neighbor 2001:DB8:CC1E:2222::2 peer-group iBGP_ipv6
 neighbor 2001:DB8:CC1E:3333::3 peer-group iBGP_ipv6
 neighbor 2001:DB8:CC1E:4444::4 peer-group iBGP_ipv6
adress-family ipv6
 neighbor 2001:DB8:CC1E:2222::2 activate
 neighbor 2001:DB8:CC1E:3333::3 activate
 neighbor 2001:DB8:CC1E:4444::4 activate

eBGP:

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router bgp 500
 neighbor 2001:DB8:CC1E:51::5 remote-as 100
address-family ipv6
 neighbor 2001:DB8:CC1E:51::5 activate

Puhh..

R2

Grundkonfig & IGP:

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ipv6 unicast-routing
 !
 interface Loopback0
 ipv6 address 2001:DB8:CC1E:2222::2/128
 ipv6 ospf 100 area 0
 !
 interface Serial0/0
 ipv6 address FE80::2 link-local
 ipv6 address 2001:DB8:CC1E:12::2/64
 ipv6 ospf 100 area 0
 !
 interface Serial0/1
 ipv6 address FE80::2 link-local
 ipv6 address 2001:DB8:CC1E:23::2/64
 ipv6 ospf 100 area 0
 !
 ipv6 router ospf 100
 router-id 2.2.2.2

iBGP:

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router bgp 500
 neighbor iBGP_ipv6 peer-group
 neighbor iBGP_ipv6 remote-as 500
 neighbor iBGP_ipv6 update-source Loopback0
 neighbor iBGP_ipv6 next-hop-self
 neighbor 2001:DB8:CC1E:1111::1 peer-group iBGP_ipv6
 neighbor 2001:DB8:CC1E:3333::3 peer-group iBGP_ipv6
 neighbor 2001:DB8:CC1E:4444::4 peer-group iBGP_ipv6
 !
 address-family ipv6
 neighbor 2001:DB8:CC1E:1111::1 activate
 neighbor 2001:DB8:CC1E:3333::3 activate
 neighbor 2001:DB8:CC1E:4444::4 activate

R3

Grundkonfig & IGP:

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ipv6 unicast-routing
 !
 interface Loopback0
 ipv6 address 2001:DB8:CC1E:3333::3/128
 ipv6 ospf 100 area 0
 !
 interface FastEthernet0/0
 ipv6 address FE80::3 link-local
 ipv6 address 2001:DB8:CC1E:36::3/64
 ipv6 ospf 100 area 0
 !
 interface Serial0/0
 ipv6 address FE80::1 link-local
 ipv6 address 2001:DB8:CC1E:43::3/64
 ipv6 ospf 100 area 0
 !
 interface Serial0/1
 ip address 172.16.23.3 255.255.255.0
 ipv6 address FE80::1 link-local
 ipv6 address 2001:DB8:CC1E:23::3/64
 ipv6 ospf 100 area 0
 !
 ipv6 router ospf 100
 router-id 3.3.3.3

iBGP:

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router bgp 500
 neighbor iBGP_ipv6 peer-group
 neighbor iBGP_ipv6 remote-as 500
 neighbor iBGP_ipv6 update-source Loopback0
 neighbor iBGP_ipv6 next-hop-self
 neighbor 2001:DB8:CC1E:1111::1 peer-group iBGP_ipv6
 neighbor 2001:DB8:CC1E:2222::2 peer-group iBGP_ipv6
 neighbor 2001:DB8:CC1E:4444::4 peer-group iBGP_ipv6
 !
 address-family ipv6
 neighbor 2001:DB8:CC1E:1111::1 activate
 neighbor 2001:DB8:CC1E:2222::2 activate
 neighbor 2001:DB8:CC1E:4444::4 activate

eBGP:

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router bgp 500
 neighbor 2001:DB8:CC1E:36::6 remote-as 100
 !
 address-family ipv6
 neighbor 2001:DB8:CC1E:36::6 activate

R4

Grundkonfig & IGP:

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interface Loopback0
 ipv6 address 2001:DB8:CC1E:4444::4/128
 ipv6 ospf 100 area 0
 !
 interface Serial0/0
 ipv6 address FE80::4 link-local
 ipv6 address 2001:DB8:CC1E:43::4/64
 ipv6 ospf 100 area 0
 !
 interface Serial0/1
 ipv6 address FE80::4 link-local
 ipv6 address 2001:DB8:CC1E:14::4/64
 ipv6 ospf 100 area 0
 !
 ipv6 router ospf 100
 router-id 4.4.4.4

iBGP:

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router bgp 500
 neighbor iBGP_ipv6 peer-group
 neighbor iBGP_ipv6 remote-as 500
 neighbor iBGP_ipv6 update-source Loopback0
 neighbor iBGP_ipv6 next-hop-self
 neighbor 2001:DB8:CC1E:1111::1 peer-group iBGP_ipv6
 neighbor 2001:DB8:CC1E:2222::2 peer-group iBGP_ipv6
 neighbor 2001:DB8:CC1E:3333::3 peer-group iBGP_ipv6
 !
 address-family ipv6
 neighbor 2001:DB8:CC1E:1111::1 activate
 neighbor 2001:DB8:CC1E:2222::2 activate
 neighbor 2001:DB8:CC1E:3333::3 activate

Verifiering: ————

R5:

ipv6-bgp-summary-r5

ipv6-bgp-unicast-r5

R2:

ipv6-bgp-summary-r2

R6:

ipv6-bgp-summary-r6

ipv6-bgp-unicast-r6

All done!

Se tidigare inlägg för information om hur vi sätter upp RIPng, EIGRP & OSPFv3.

BGP, IPv6
This post is licensed under CC BY 4.0 by the author.
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