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BGP Route Reflector Design
Plan Cisco BGP route reflectors for the required scale, resilience and policy visibility, checking how path selection affects the wider network.
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.
BGP route reflector design helps larger networks exchange internal BGP routes without maintaining a full mesh of sessions between every participating router. That reduces a management problem, but it introduces decisions about path visibility, resilience and route selection. MCI Network Services designs and reviews Cisco route-reflector arrangements for enterprise and specialist networks, including estates where an inherited hierarchy has become difficult to troubleshoot.
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.
Establish whether reflection solves the right problem
We first map the internal BGP speakers, address families and route volumes. A small network may not need route reflection at all. A larger topology may benefit from it, particularly where adding a router would otherwise require changes across many peers. The assessment distinguishes genuine scale requirements from a design that has simply accumulated unnecessary sessions.
The route reflector normally performs a control-plane role; it does not have to carry the traffic described by the routes it distributes. We make that distinction clear in diagrams and support procedures. A reflector can appear healthy while clients lack a usable path to an advertised next hop. Conversely, forwarding may continue for a period while control-plane resilience has already been lost.
Standards & partnerships
Confidence in the team behind your network.
Cisco Partner
Cisco Meraki
Cyber Essentials
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Design client groups and failure boundaries
Clients should have an appropriate route to more than one reflector where the availability requirement justifies it. We consider the physical location, underlying connectivity and power dependencies of the reflector pair. Two virtual machines on the same host or two devices behind one management failure domain may not provide the independence the customer expects.
The design records client and non-client relationships, cluster identifiers and router identifiers. Those values affect loop prevention and route propagation and should not be assigned casually during deployment. We review how a route is expected to travel through the hierarchy, including what happens when a reflector or an inter-site path is unavailable.
A useful starting point
Not sure where to start?
Bring the requirement. We will help you define the engineering work.
Consider the client’s view of the best path
A reflector’s preferred route may differ from the route a client would choose with a complete view of the topology. The reflector’s location and its reachability to next hops can therefore influence the paths made available to clients. We assess that behaviour against the business requirement rather than assuming reflection is operationally identical to a full mesh.
Supported features such as additional-path advertisement or optimal route reflection may help in particular environments. They require platform, release and design checks; they are not universal settings to enable on every Cisco router. We document the reason for using them and the additional scale or complexity they introduce. Where a simpler topology meets the requirement, that may be preferable.
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 ↗Keep next-hop reachability and policy explicit
Route distribution depends on more than the BGP sessions themselves. Clients need the appropriate underlying routes to reach next hops, and policy must preserve or deliberately change attributes as intended. We review the relationship between the internal routing protocol and reflected routes, including any virtual routing contexts or overlay address families.
Policy consistency is also important. A route filter or community action on one reflector but not the other can create behaviour that changes during a failure. We compare configurations and define which policies belong at the network edge, at the reflector or at the client. This avoids hiding service-specific exceptions inside a supposedly neutral distribution layer.
Test propagation and convergence
Acceptance tests follow selected prefixes from their origin through the reflectors to representative clients. We check the received path information, the selected route and actual forwarding. Tests include important alternate paths, not only the route that wins under normal conditions. The aim is to understand what a client can use after a fault.
We agree safe failure tests for individual sessions, reflectors and underlying links. Restoration is observed as well, because a returning path can change traffic preferences again. Where an application is sensitive to interruption, its owner participates in the acceptance criteria. A route count alone cannot demonstrate the effect on that application.
Plan a migration from the existing topology
Replacing a full mesh or an older reflector hierarchy should be staged. We identify temporary parallel sessions, policy differences and the point at which old relationships can be removed. A pilot client group can expose unexpected path selection before the wider estate is changed.
The rollback plan must account for both configuration and route propagation. We retain the original peer map and ensure that emergency changes do not create a loop or isolate a client group. Completion includes removing obsolete sessions and updating the operational diagrams, rather than leaving two competing designs indefinitely.
Leave a clear operating model
MCI supplies a reflector topology, client register, policy record and test evidence. Ongoing monitoring can distinguish a failed reflector from a single client-session issue and identify when redundancy has been lost. For wider policy work, see BGP communities and policy. Share the current peer topology and growth requirements to scope a design that your operations team can maintain confidently.
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.
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Most of our engineers are based in Kent, with a focus on London, Sussex, Essex and Berkshire.
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