6-72Preference: 0 Cost: 100NextHop: 2.0.1.1 Interface: Vlan-interface201BkNextHop: 0.0.0.0 BkInterface:RelyNextHop: 2.0.2.1 Neighbor : 2.0.1.1Tunnel ID: 0x0 Label: NULLState: Active Adv Age: 00h09m54sTag: 0The above output shows that Switch C has one route to reach network 1.1.1.0/24, that is, SwitchC<—>Switch D<—>Switch A.BGP GR ConfigurationNetwork requirementsIn the following figure are all BGP switches. Between Switch A and Switch B is an eBGP connection.Switch B and Switch C are connected over an iBGP connection. Enable GR Capability for BGP so thatthe communication between Switch A and Switch C is not affected when an active/standby main boardswitchover occurs on Switch B.Figure 6-28 Network diagram for BGP GR configurationConfiguration procedure1) Configure Switch A# Configure IP addresses for interfaces (omitted).# Configure the eBGP connection. system-view[SwitchA] bgp 65008[SwitchA-bgp] router-id 1.1.1.1[SwitchA-bgp] peer 200.1.1.1 as-number 65009# Inject network 8.0.0.0/8 to the BGP routing table.[SwitchA-bgp] network 8.0.0.0# Enable GR capability for BGP.[SwitchA-bgp] graceful-restart2) Configure Switch B# Configure IP addresses for interfaces (omitted).# Configure the eBGP connection. system-view[SwitchB] bgp 65009[SwitchB-bgp] router-id 2.2.2.2[SwitchB-bgp] peer 200.1.1.2 as-number 65008# Configure the iBGP connection.
