Cisco Wide Area Application Engine 612 Bedienungsanleitung PDF herunterladen (Seite 9)

Interface Connectivity 83

Figure 4-3 WAE Connected Using Standby Interface Feature

The failure of the active interface in the standby group is detected using three different

methods. The ﬁrst method monitors the link state of the active interface. Line protocol is up

when the RUNNING ﬂag is present on the Ethernet interface. If line protocol fails on the

active interface, the interface is marked as down.

The second method uses an ICMP ping to check availability of the default gateway conﬁgured

on the WAE. An ICMP echo request is sent once every 10 seconds to the conﬁgured default

gateway. If there is a response to the echo request, the interface is considered up. If there is

no response to the echo request, ﬁve more echo requests are sent. If at least three responses

are received, the interface is considered up. Otherwise, the interface is considered failed,

and the interface is marked as down.

The ﬁnal method available for monitoring the health of the active interface uses the interface

error count to determine if an unacceptable number of errors have been seen on the

interface. The error count is the absolute number of transmit and receive errors on the active

interface. This check is disabled by default, but can be enabled using the following

command:

errors

1-2147483647

The interface state and error counts (when conﬁgured) are checked once every 10 seconds.

If the active link fails or the error count threshold is exceeded, the interface with the next

highest priority is activated. When the failed interface recovers, it becomes the standby

gigabitEthernet 1/0

gigabitEthernet 2/0

WAN

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Cisco Wide Area Application Engine 612 Bedienungsanleitung Seite 9