Filter
Top Products
Alteon OS Application Guide
182
Chapter 11: Border Gateway Protocol 42C4911, January 2007
BGP Failover Configuration
Use the following example to create redundant default gateways for a GbE Switch Module 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 11-3, 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 GbE Switch Module.
Figure 11-3 BGP Failover Configuration Example
On the GbE Switch Module, 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.
BladeCenter
BladeCenter
GbE Switch
Module
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
GbE Switch
Module