Using Extreme Standby Router Protocol; Configuring Esrp; Esrp Commands - Extreme Networks BlackDiamond 6800 User Manual

U
SING
The Extreme Standby Router Protocol (ESRP) provides a way to keep hosts
communicating when a physical router becomes unavailable. ESRP works by allowing
you to configure a virtual router on two or more BlackDiamond systems (and Summit
switches) that are part of the same network segment. Connected hosts are then
configured using the IP address of the virtual router as the default gateway.
Only one of the virtual routers is active at any given time. This device is called the
active router. The other BlackDiamond systems and Summit switches remain in standby
mode. In the event that the active router fails (determined by the virtual router hello
timer), one of the standby routers becomes the active router.
The active router is elected using a priority-based election process. You can configure
the priority for each configured device. If the virtual router priority is not configured,
the active virtual router is selected by way of the internal MAC address.
You can set up multiple ESRP groups that service different Ethernet segments. You can
have a maximum of 32 ESRP groups on your network.
C
ONFIGURING
To configure ESRP on the BlackDiamond, create a VLAN that will be used specifically
for ESRP.
Table 8-1
Table 8-1: ESRP Commands
Command
enable esrp vlan <name>
config vlan <name> esrp group <number>
config vlan <name> esrp priority <value>
B D U G
LACK IAMOND SER UIDE
E S
XTREME TANDBY
ESRP
describes the commands used to configure ESRP.
U E
SING XTREME
R P
OUTER ROTOCOL
Description
Enables ESRP on a VLAN.
Assigns a VLAN to an ESRP group. The
valid group numbers are from 1 to 32. The
default setting is 1.
Configures the virtual router priority. The
range is 0 to 255. The default setting is 0.
S R P
TANDBY OUTER ROTOCOL
8-11