Cisco Expressway Cluster Creation and Maintenance Deployment Guide (X15.4) - Clustering Requirements

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-4/cluster_creation_maint/exwy_b_cisco-expressway-cluster-creation-and-maintenance-deployment-guide-x154/exwy_m_clustering-requirements.html

Published

2026-02-09

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

Cisco copyrighted documentation; no-redistribution; short excerpts and locators only

Source notes citing this source

• Peers on standard appliances can be clustered with peers on 2-core Medium VMs, but not with peers on 8-core Large VMs. in context
• Cisco recommends a DNS SRV record for the Expressway cluster containing A or AAAA records for each peer. in context
• Because peers must be within 80 ms round trip with no NAT between them, a single Expressway cluster can only span sites with low-latency routed connectivity; widely separated regions would need separate clusters. inferred in context
• For Mobile and Remote Access, a collab-edge SRV record should be created for each peer in the Expressway-E cluster. in context
• An Expressway cluster must contain only Expressway-C nodes or only Expressway-E nodes; the two cannot be mixed in one cluster. in context
• There must be no NAT between Expressway cluster peers, and any firewall between them must open the required ports. in context
• Clusters mixing Expressway and Expressway Select peers are not supported. in context
• All cluster peers must have the same set of option keys installed, except RMS licenses and room system and desktop system registration licenses. in context
• Expressway clustering supports a round-trip delay of up to 80 ms between peers. in context
• All peers in an Expressway cluster must run the same software version, except for the short period while the cluster is being upgraded. in context
• If Cisco TMS is used with an Expressway cluster it must run version 13.2 or later, or 12.6 or later if TMS is not used for provisioning or FindMe. in context

Cite this source record

APA

WarmTransfer. (2026, February 9). Cisco Expressway Cluster Creation and Maintenance Deployment Guide (X15.4) - Clustering Requirements. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-exwy-cluster-x154-requirements

BibTeX

@misc{warmtransfer-cisco-exwy-cluster-x154-requirements,
  title  = {Cisco Expressway Cluster Creation and Maintenance Deployment Guide (X15.4) - Clustering Requirements},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-exwy-cluster-x154-requirements},
  note   = {Cisco Systems, accessed 2026-09-25}
}