Cisco Wide Area Application Engine 612 Bedienungsanleitung PDF herunterladen (Seite 10)

84 Chapter 4: Network Integration and Interception

interface for the group. The standby interface does not have a preempt capability. When a

new interface is activated, the WAE generates a gratuitous ARP to update the MAC address

for the shared IP on all other devices on the same subnet. This prevents devices from sending

trafﬁc to the shared IP address on the WAE to the MAC address of the failed WAE interface.

Standby Interface Conﬁguration

Conﬁguring the standby interface feature in WAAS involves the following steps:

Step 1 Create a virtual standby interface.

Step 2 Conﬁgure an IP address and subnet mask for the standby interface.

Step 3 Assign the physical interfaces to the standby group.

Example 4-6 shows a basic standby interface conﬁguration.

You should observe the following limitations when conﬁguring the standby interface

feature within WAAS:

• The physical interfaces in the standby group do not require IP addresses.

• The standby interface feature does not have a preempt capability.

Each physical interface can be assigned a numeric priority between 1 and 2,147,483,647.

The default standby priority for an interface is 100. The virtual standby interface uses

the MAC address of the active interface. When the active interface fails and the standby

interface takes over, the WAE generates a gratuitous ARP request to update the adjacent

devices with the new MAC address associated with the WAE IP address.

Example 4-6 WAE Standby Interface Conﬁguration

interface Standby 1

ip address 10.88.80.130 255.255.255.128

exit

interface GigabitEthernet 1/0

standby 1 priority 105

exit

interface GigabitEthernet 2/0

standby 1

exit

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Cisco Wide Area Application Engine 612 Bedienungsanleitung Seite 10