Connect. Secure. Manage.
IP Multicast
Cisco multicast design and troubleshooting for applications that distribute traffic to many receivers, with controlled forwarding and usable fault diagnostics.
Devices supported
across the UK
Client locations
supported
Traffic handled
at peak time
Average
response time
Average response is not a resolution time or a contractual guarantee. Support scope and response commitments are agreed for each engagement.
IP multicast distributes traffic from a source to a group of receivers without requiring the source to send a separate copy to every destination. It is useful for services such as financial-market feeds, video distribution and certain operational systems, but its forwarding behaviour differs from ordinary unicast traffic. MCI Network Services provides Cisco multicast design, implementation and troubleshooting, with attention to receiver membership, routing state and the application’s own recovery requirements.
Cisco-focused engineering
Design around the platform, traffic and failure behaviour you actually operate.
Change with evidence
Use pre-checks, acceptance criteria and a documented route back.
Operational handover
Keep the configuration, diagrams and responsibilities understandable after delivery.
Define the source and receiver service
We begin with the application: where traffic originates, which receivers need it and how they request membership. Group addresses alone are not enough. The design also needs source addresses, transport ports, expected rates, addressing boundaries and any restrictions imposed by a provider or application supplier.
A multicast packet arriving at a receiver does not necessarily mean the application can use it. Entitlements, feed formats and host configuration remain separate dependencies. We define the network responsibility and the evidence needed from application owners so that acceptance testing does not confuse successful packet delivery with complete service readiness.
Standards & partnerships
Confidence in the team behind your network.
Cisco Partner
Cisco Meraki
Cyber Essentials
Cyber Essentials PlusMCI Network Services is operated by Proxar Ltd. Certifications apply to the certified legal entity and the scope of its certificates. View accreditation information
Choose the appropriate distribution model
Any-source and source-specific multicast serve different requirements. In an any-source design, receivers request a group and the network may use a rendezvous point to establish distribution. A source-specific design identifies the source and group together and requires compatible receiver signalling and network support.
We assess the model used by the application rather than force a preferred technology onto an incompatible service. The Cisco Source-Specific Multicast page explains that particular approach. Where a third-party provider defines the addressing and membership behaviour, its documented handoff requirements form part of the design baseline.
A useful starting point
Not sure where to start?
Bring the requirement. We will help you define the engineering work.
Coordinate switching and multicast routing
Within a switched network, IGMP snooping can limit IPv4 multicast forwarding to relevant ports when membership and querier behaviour are correctly established. Across routed boundaries, a supported multicast routing design is needed. Enabling a feature on one switch does not create end-to-end delivery through every router, firewall and receiver VLAN.
We map the complete traffic path and distinguish multicast state from ordinary unicast reachability. Reverse-path checks, group membership and outgoing interface state each contribute to the result. A successful ping to the source is useful information, but it does not prove that multicast packets are accepted and forwarded toward the receiver.
Different environments. The same care.
Built around the work
your network supports.
Finance, banking and the wider private sector. We start with the systems and people that depend on your connections.
Finance & banking
Market-data paths, routing and provider coordination on clients’ behalf.
Financial-market services ↗Offices & multi-site teams
Reliable access between people, workplaces and business applications.
Office network design ↗Data centres & cloud
Network boundaries, workload connections and operational ownership.
Data centre networks ↗Plan bandwidth and replication points
Multicast can reduce duplication at the source while still creating substantial load where the network replicates traffic to many receivers. We review the expected stream rates, number of groups, interface capacity and the hardware’s supported forwarding scale. Bursts may matter even where average utilisation appears modest.
The assessment includes failure conditions. If traffic moves to a smaller backup path, the network may retain routing state while dropping packets through congestion. We consider the application’s tolerance for loss and whether redundant feeds, replay or other recovery mechanisms exist outside the network itself.
Keep multicast within its intended boundaries
Group ranges, source permissions and routing boundaries should be deliberate. We check where traffic may enter or leave the estate and which receivers are authorised to request it. Multicast membership is not a substitute for application licensing or access control, particularly with externally supplied market data.
Firewalls, address translation and virtualised receivers can introduce additional constraints. We review the actual platform support and packet path rather than assume that behaviour tested with ordinary client traffic applies unchanged. Any capture or diagnostic data is handled under the customer’s agreed access and confidentiality requirements.
Test join, delivery and recovery separately
Acceptance testing follows a receiver joining the required service, receiving traffic and leaving when appropriate. We also consider changes in source location, routing and the loss of an agreed path. The observations should identify which packet flow was tested and the point at which it was measured.
For financial-market applications, a sequence gap may be detected after the underlying loss occurred, and application recovery can last longer than the network interruption. We keep those times distinct. The related financial-market multicast service focuses on client-side network delivery and provider coordination without presenting the provider as an MCI customer or endorser.
Make faults easier to investigate
A supportable multicast service has a source-and-group register, topology records, expected membership behaviour and useful monitoring. Engineers should know where to inspect incoming traffic, routing state and receiver-side delivery. Evidence from more than one point helps distinguish upstream loss from local forwarding or host issues.
MCI can build a new Cisco multicast service or investigate an existing one that is intermittent, flooding unnecessary ports or failing after a topology change. The engagement provides a defined network scope, practical tests and operational records, so the service can be supported without relying on a single engineer’s memory.
Talk to a specialist
What does your network need next?
Tell us what you are planning, changing or trying to improve. We will help define a practical next step and the engineering scope.
+44 203 196 6566Choose option 1
sales@proxar.co.ukUK-wide service.
Most of our engineers are based in Kent, with a focus on London, Sussex, Essex and Berkshire.
Existing customers should use their agreed support and escalation channels. This form is for service enquiries, not a monitored emergency ticket.
Tell us what you need.
A short outline is enough. Please do not include passwords or sensitive network details.
Thank you. Your enquiry has been submitted.
Please check your name, email and message, then try again.
Your form session expired. Please try again.
Please wait a minute before sending another enquiry.
We could not submit your enquiry. Please call or email us instead.