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Configuration procedure
1. Configure IPv6 addresses for interfaces. (Details not shown.)
2. Configure OSPFv3 in AS 200 to ensure connectivity among Switch B, Switch C, and Switch D.
(Details not shown.)
3. Configure BGP connections:
# Configure Switch A to establish EBGP sessions to Switch B and Switch C, and advertise
network 1::/64.
<SwitchA> system-view
[SwitchA] bgp 100
[SwitchA] router-id 1.1.1.1
[SwitchA-bgp-default] peer 3001::2 as-number 200
[SwitchA-bgp-default] peer 2001::2 as-number 200
[SwitchA-bgp-default] address-family ipv6 unicast
[SwitchA-bgp-default-ipv6] peer 3001::2 enable
[SwitchA-bgp-default-ipv6] peer 2001::2 enable
[SwitchA-bgp-default-ipv6] network 1:: 64
[SwitchA-bgp-default-ipv6] quit
[SwitchA-bgp-default] quit
# Configure Switch B to establish an EBGP session to Switch A, and an IBGP session to Switch
D.
<SwitchB> system-view
[SwitchB] bgp 200
[SwitchB] router-id 2.2.2.2
[SwitchB-bgp-default] peer 3001::1 as-number 100
[SwitchB-bgp-default] peer 3002::2 as-number 200
[SwitchB-bgp-default] address-family ipv6 unicast
[SwitchB-bgp-default-ipv6] peer 3001::1 enable
[SwitchB-bgp-default-ipv6] peer 3002::2 enable
[SwitchB-bgp-default-ipv6] peer 3002::2 next-hop-local
[SwitchB-bgp-default-ipv6] quit
[SwitchB-bgp-default] quit
# Configure Switch C to establish an EBGP session to Switch A, and an IBGP session to Switch
D.
<SwitchC> system-view
[SwitchC] bgp 200
[SwitchC] router-id 3.3.3.3
[SwitchC-bgp-default] peer 2001::1 as-number 100
[SwitchC-bgp-default] peer 2002::2 as-number 200
[SwitchC-bgp-default] address-family ipv6 unicast
[SwitchC-bgp-default-ipv6] peer 2001::1 enable
[SwitchC-bgp-default-ipv6] peer 2002::2 enable
[SwitchC-bgp-default-ipv6] peer 2002::2 next-hop-local
[SwitchC-bgp-default-ipv6] quit
[SwitchC-bgp-default] quit
# Configure Switch D to establish IBGP sessions to Switch B and Switch C, and advertise
network 4::/64.
<SwitchD> system-view
[SwitchD] bgp 200
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