How XRN Interacts with other Features 439
Figure 109 How XRN interacts with VLANs — Example 1
The Distributed Resilient Routing (DRR) feature also requires that all units can
communicate with each other on all VLANs. This ensures that on an interconnect
failure all units can communicate with each other.
For example in Figure 110 the interconnect has failed and only one of the units in
the Distributed Fabric will act as the router. STP will detect a potential loop and
block a path of its choosing, in this example it has blocked the path between
Switch X units and Switch A. If ports have different VLAN membership as shown
here there will be loss of communication between VLANs 1 and 2.
Figure 110 How XRN interacts with VLANs — Example 2
Legacy Aggregated
Links
Legacy aggregated links, will react in the normal way if a unit within the
Distributed Fabric fails, that is, all traffic will be redirected down the link(s) to the
unit that is still operating.
VLAN2
VLAN 1
Switch 5500 units
XRN Distributed Fabric
802.3ad
Aggregated Link
VLAN ID 1, 2
VLAN ID 1, 2
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