H3C Technologies H3C S12500 Series Switches - Manual (Page 261)

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[SwitchC-ospf-1-area-0.0.0.0] network 3.3.3.3 0.0.0.0
[SwitchC-ospf-1-area-0.0.0.0] network 9.1.1.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.0] quit
[SwitchC-ospf-1] quit
[SwitchC] display bgp peer
BGP local router ID : 3.3.3.3
Local AS number : 65009
Total number of peers : 1 Peers in established state : 1
Peer AS MsgRcvd MsgSent OutQ PrefRcv Up/Down State
2.2.2.2 65009 2 2 0 0 00:00:13 Established
The output shows that Switch C has established an IBGP peer relationship with Switch B.
3. Configure EBGP:
{
The EBGP peers, Switch A and Switch B (usually belong to different carriers), are located in
different ASs. Typically, their loopback interfaces cannot reach each other, so directly
connected interfaces are used for establishing BGP sessions.
{
To enable Switch C to access the network 8.1.1.0/24 directly connected to Switch A, inject
network 8.1.1.0/24 to the BGP routing table of Switch A.
# Configure Switch A.
system-view
[SwitchA] bgp 65008
[SwitchA-bgp] router-id 1.1.1.1
[SwitchA-bgp] peer 3.1.1.1 as-number 65009
[SwitchA-bgp] network 8.1.1.1 24
[SwitchA-bgp] quit
# Configure Switch B.
[SwitchB] bgp 65009
[SwitchB-bgp] peer 3.1.1.2 as-number 65008
[SwitchB-bgp] quit
# Display BGP peer information on Switch B.
[SwitchB] display bgp peer
BGP local router ID : 2.2.2.2
Local AS number : 65009
Total number of peers : 2 Peers in established state : 2
Peer AS MsgRcvd MsgSent OutQ PrefRcv Up/Down State
3.3.3.3 65009 4 4 0 0 00:02:49 Established
3.1.1.2 65008 2 2 0 0 00:00:05 Established
The output shows that Switch B has established an IBGP peer relationship with Switch C and an
EBGP peer relationship with Switch A.
# Display the BGP routing table on Switch A.
[SwitchA] display bgp routing-table