Cisco Cisco Expressway Maintenance Manual
relay licenses; these licenses can be installed on any cluster peer and are available for use by any peer in the cluster.
Sharing Bandwidth Across Peers
When clustering has been configured, all peers share the bandwidth available to the cluster.
Cluster Upgrades, Backup and Restore
Upgrading a cluster
Backing up a cluster
The backup process saves all configuration information for the cluster, regardless of the Expressway used to make
the backup.
the backup.
Restoring a cluster
You cannot restore data to an Expressway that is a part of a cluster.
To restore previously backed up cluster configuration data you must follow this process:
1.
Remove the Expressway peer from the cluster so that it becomes a standalone Expressway.
2.
Restore the configuration data to the standalone Expressway.
3.
Build a new cluster using the Expressway that now has the restored data.
4.
for more information about adding and removing cluster peers.
Neighboring Between Expressway Clusters
You can neighbor your local Expressway (or Expressway cluster) to a remote Expressway cluster; this remote cluster
could be a neighbor, traversal client, or traversal server to your local Expressway. In this case, when a call is received
on your local Expressway and is passed via the relevant zone to the remote cluster, it will be routed to whichever peer
in that neighboring cluster has the lowest resource usage. That peer will then forward the call as appropriate to one
of its external zones.
could be a neighbor, traversal client, or traversal server to your local Expressway. In this case, when a call is received
on your local Expressway and is passed via the relevant zone to the remote cluster, it will be routed to whichever peer
in that neighboring cluster has the lowest resource usage. That peer will then forward the call as appropriate to one
of its external zones.
Lowest resource usage is determined by comparing the number of available media sessions (maximum - current use)
on the peers, and choosing the peer with the highest number. Peers that are in maintenance mode are not
considered.
on the peers, and choosing the peer with the highest number. Peers that are in maintenance mode are not
considered.
When configuring a connection to a remote cluster, you create a single zone and configure it with details of all the
peers in the cluster. Adding this information to the zone ensures that the call is passed to that cluster regardless of
the status of the individual peers.
peers in the cluster. Adding this information to the zone ensures that the call is passed to that cluster regardless of
the status of the individual peers.
You also need to enter the IP address of all peers in the remote cluster when the connection is via a neighbor or
traversal client zone. You do not do this for traversal server zones, as these connections are not configured by
specifying the remote system's IP address.
traversal client zone. You do not do this for traversal server zones, as these connections are not configured by
specifying the remote system's IP address.
Note:
Systems that are configured as peers must not also be configured as neighbors to each other, and vice versa.
Neighboring your clusters
To neighbor your local Expressway (or Expressway cluster) to a remote Expressway cluster, you create a single zone
to represent the cluster and configure it with the details of all the peers in that cluster:
to represent the cluster and configure it with the details of all the peers in that cluster:
123
Cisco Expressway Administrator Guide