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Cisco ONS 15454 Reference Manual, R7.0
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Chapter 11 Circuits and Tunnels
11.21 11.21 VLAN Management
11.21 VLAN Management
In Software Release 4.6 and later, VLANs are populated within topologies to limit broadcasts to each
topology rather than to the entire network. Using the Manage VLANs command in the Tools menu, you
can view a list of topology hosts and provisioned VLANs. You create VLANs during circuit creation or
with the Manage VLANs command. When creating a VLAN, you must identify the topology host (node)
where the VLAN will be provisioned. The Manage VLANs command also allows you to delete existing
VLANs.
11.22 Server Trails
A server trail is a non-DCC link across a third-party network that connects two CTC network domains.
A server trail allows circuit provisioning when no DCC is available. You can create server trails between
any two optical or DS-3 ports. The end ports on a server trail can be different types (for example, an
OC-3 port can connect to an OC-12 port). Server trails are not allowed on DCC-enabled ports.
Note A physical link must exist, end to end, and be in tact to route circuits across a server trail.
The server trail link is bidirectional and can be VT1.5, VT2, STS1, STS-3c, STS-6c, STS-12c, STS-48c,
or STS-192c; you cannot upgrade an existing server trail to another size. A server trail link can be one
of the following protection types: Preemptible, Unprotected, and Fully Protected. The server trail
protection type determines the protection type for any circuits that traverse it. PCA circuits will use
server trails with the Preemptible attribute.
When creating circuits or VCATs, you can choose a server trail link during manual circuit routing. CTC
may also route circuits over server trail links during automatic routing. VCAT common-fiber automatic
routing is not supported.