Cisco Cisco Expressway Maintenance Manual
Note that if the master fails, the remaining peers will continue to function normally, except they are no longer
able to copy their configuration from the master so they may become out of sync with each other.
able to copy their configuration from the master so they may become out of sync with each other.
To change the master peer you must log in to every other Expressway in the cluster and change the
configuration master on each peer:
configuration master on each peer:
1. Log in to the Expressway and go to
System > Clustering
.
2. Change the Configuration master to the peer you want to set as the new master (the numbers match
against the Peer IP address fields underneath).
3. Click Save.
4. Repeat this for every peer in the cluster, ensuring that you select the same new master on each peer.
Note that during this process you may see alarms raised on some peers about inconsistent master peer
configuration. These alarms will be lowered when every peer in the cluster is configured with the new master.
configuration. These alarms will be lowered when every peer in the cluster is configured with the new master.
Monitoring the status of the cluster
The status sections at the bottom of the
Clustering
page show you the current status of the cluster, and the
time of the previous and next synchronization.
Specifying peer-specific items in clustered systems
Most items of configuration are applied to all peers in a cluster. However, the following items (marked with a
†
on the web interface) must be specified separately on each cluster peer.
Cluster configuration (System > Clustering)
The list of Peer IP addresses (including the peer's own IP address) that make up the cluster has to be
specified on each peer and they must be identical on each peer.
specified on each peer and they must be identical on each peer.
The Cluster name and Cluster pre-shared key have to be specified on each peer and must be identical for
all peers.
all peers.
Ethernet speed (System > Ethernet)
The Ethernet speed is specific to each peer. Each peer may have slightly different requirements for the
connection to their Ethernet switch.
connection to their Ethernet switch.
IP configuration (System > IP)
LAN configuration is specific to each peer.
n
Each peer must have a different IPv4 address and a different IPv6 address.
n
IP gateway configuration is peer-specific. Each peer can use a different gateway.
n
IP routes (also known as static routes) are peer-specific. If these are used, they can be different for each
peer.
peer.
Note that the IP protocol is applied to all peers, because each peer must support the same protocols.
System name (System > Administration)
The System name must be different for each peer in the cluster.
DNS servers and DNS host name (System > DNS)
DNS servers are specific to each peer. Each peer can use a different set of DNS servers.
Cisco Expressway Administrator Guide (X8.1)
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Clustering and peers
Managing clusters and peers