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A

PPENDIX

 D: 3C

OM

 XRN

The Switch 4200 is using legacy STP. STP (and RSTP) will reconfigure the network 
to open the previously blocked link to Switch B. The STP reconfiguration will cause 
all Switch forwarding databases (MAC address tables) to be fast aged (if using 
RSTP, they will be flushed). If STP is enabled throughout the network, it will 
reconfigure the network to ensure that no loops occur due to split aggregated 
links.

If the Distributed Fabric has been configured to be the root bridge in the network 
then this will encourage STP to maintain the traffic flow through the shortest 
paths in the event of an Fabric Interconnect failure.

The Switch 3300 will continue to send traffic down the active link to Switch A and 
keep the link to Switch B in standby mode.

As all VLANs will have been configured on all links, the traffic will still reach its 
destination using the paths that remain open.

Initially both Switches continue to route. Simultaneously the Switches attempt to 
contact each other and carry out a process that determines which Switch will 
become the Layer 3 router and which Switch will become the Layer 2 bridge. This 
avoids the scenario of two different and independent routers operating with the 
same identity.

When the interconnect recovers and starts to operate again, all links will 
reconfigure themselves as they were before the failure, according to the protocols 
used. The routing task will once again be shared between Switches A and B, using 
the same IP address.