Versatile Service Module
7750 SR OS Services Guide Page 1231
Internal Service CCAG
VSM CCAs are placed in a CCAG. A CCAG provides a mechanism to aggregate multiple CCAs
into a single forwarding group. The CCAG uses conversation hashing to dynamically distribute
cross-connect traffic to the active CCAs in the aggregation group. In the event that an active CCA
fails or is removed from the group, the conversation hashing function redistributes the traffic over
the remaining active CCAs within the group.
The conversation hashing mechanism performed for a CCAG is identical to the hashing functions
performed for Ethernet LAGs (Link Aggregation Groups).
Internal Service Cross Connect Identifier (CCID)
Services and IP interfaces are bound to a CCAG through a CCID (Cross Connect Identifier).
When two services or a service and an IP interface are assigned the same CCID the CCAG
attempts to provide a cross connection path between the objects. The CCID enables multiple pairs
of cross connected services to share the same CCAG.
Figure 1: Internal Service Interconnection Using CCID
From a service perspective, a CCID is an object that not only binds two services together, but also
provides the attachment point for the ingress and egress QoS, filtering, and accounting parameters.
When considered in conjunction with the CCAG, it allows the actual cross connection path
(through the CCAs) to be indirectly associated with the services using the CCAG and maintains a
simplified provisioning model over port level cross connected services.
CCAG
Services are cross
connected by binding each
service to a common CCID
on the same CCAG
SVC 1 SVC 2
CCID ‘x’ CCID ‘x’
To Next Page
Loading...
