Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario descargar pdf (Pagina 49)

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vss(config-if)#ip address 10.1.2.1 255.255.255.0

vss(config-if)#bfd interval 100 min_rx 100 multiplier 50

vss(config-if)#no shutdown

vss(config-if)#exit

Note that in a Cisco Virtual Switching System environment, both interfaces are seen to be Layer 3 routed interfaces

on the same logical router and hence require different network addresses even though they are directly connected

together.

To enable IP-BFD for dual-active detection, use the following configuration:

vss(config)#switch virtual domain 10

vss(config-vs-domain)#dual-active detection bfd

vss(config-vs-domain)#dual-active pair interface gig1/5/1 interface gig2/5/1 bfd

adding a static route 10.1.2.0 255.255.255.0 Gi1/5/1 for this dual-active pair

adding a static route 10.1.1.0 255.255.255.0 Gi2/5/1 for this dual-active pair

vss#show switch virtual dual-active bfd

Bfd dual-active detection enabled: Yes

Bfd dual-active interface pairs configured:

interface-1 Gi1/5/1 interface-2 Gi2/5/1

Note that by configuring these commands, static routes are automatically added for the remote addresses and are

installed in the Routing Information Base (RIB) only if a dual-active scenario occurs. As a result, no packets are

forwarded between the switches through the heartbeat interfaces until the VSL is brought down.

When the VSL does go down, a unique internal MAC address (selected from the pool of MAC addresses reserved for

the line card) is assigned for each of the local interfaces, and sending BFD heartbeat packets brings up BFD

neighbors. If the standby virtual switch has taken over as active, a BFD “adjacency-up” event is generated, indicating

that a dual-active situation has occurred.

Fast-Hello Detection

With 12.2(33)SXI, a Fast-Hello detection mechanism was introduced. This is similar to IP-BFD, as it is a dedicated

direct link heartbeat between the VSS switches. However, Fast-Hello is a L2 connection and you can configure up to

4 non-VSL links. The two chassis will periodically exchange fast-hello heartbeat packets that contain the switch state.

When the VSL fails, the fast hello packets are no longer received on each switch, thus indicating that a dual -active

scenario has occurred (Figure 37).

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Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario Pagina 49