Specifications

Multiple EAPS Domains

ExtremeWare XOS 11.0 Concepts Guide 181

Figure 13: EAPS data VLAN spanning two rings interconnected by one switch

Multiple EAPS Domains per Ring—Spatial Reuse

To take advantage of the spatial reuse technology and broaden the use of the ring’s bandwidth, EAPS

supports multiple EAPS domains running on the ring at the same time(Figure 14).

Figure 14: Multiple EAPS domains per ring

So, a single ring might have two EAPS domains running on it. Each EAPS domain would have a

different EAPS master node. Each EAPS domain will protect its own set of protected VLANS.

Multiple EAPS Rings Sharing a Common Link

When you configure EAPS on multiple rings with a common link and the Spanning Tree Protocol (STP)

is not configured, you may experience a loop situation across both rings. For example, if the link shown

in Figure 15 between switches S5 and S10 breaks, we will have a loop between the 2 rings. To prevent

that, we have to run STP on the 2 common switches S5 and S10.

EW_073

Master

node

Master

node

Ring 1 Ring 2

EX_100

EAPS 1

EAPS 2

Master EAPS 1

Transit EAPS 2

Master EAPS 2

Transit EAPS 1

Transit EAPS 2

Transit EAPS 1

Transit EAPS 2