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BLADE OS 5.1 Application Guide
140
Chapter 10: Border Gateway Protocol BMD00136, November 2009
BGP Failover Configuration
Use the following example to create redundant default gateways for a G8000 at a Web Host/ISP
site, eliminating the possibility, should one gateway go down, that requests will be forwarded to an
upstream router unknown to the switch.
As shown in Figure 20, the switch is connected to ISP 1 and ISP 2. The customer negotiates with
both ISPs to allow the switch to use their peer routers as default gateways. The ISP peer routers will
then need to announce themselves as default gateways to the G8000.
Figure 20 BGP Failover Configuration Example
On the G8000, one peer router (the secondary one) is configured with a longer AS path than the
other, so that the peer with the shorter AS path will be seen by the switch as the primary default
gateway. ISP 2, the secondary peer, is configured with a metric of “3,” thereby appearing to the
switch to be three router hops away.
1. Define the VLANs.
For simplicity, both default gateways are configured in the same VLAN in this example. The
gateways could be in the same VLAN or different VLANs
.
BladeCenter
G8000
VIP: 200.200.200.200
IP: 200.200.200.1
IP: 210.210.210.1
Server 1
IP: 200.200.200.10
Server 2
IP: 200.200.200.11
VIP: 200.200.200.200
IP: 200.200.200.1
IP: 210.210.210.1
>> # vlan 1
>> (config-vlan)# member <port number>