Routing Calculators

30 free routing calculators in Networking.

Administrative DistanceCompare administrative distances across routing protocols to determine the preferred route.
BGP Best Path CalculatorCompare two BGP paths through the real tie-break order and see which attribute decides the winner.
BGP Community CalculatorConvert between AS:value and 32-bit BGP community notation, in hex, and identify well-known community values.
BGP Prefix CalculatorCalculate the number of BGP prefixes and routing table impact for an address block.
BGP Route Reflector PlannerCompare iBGP full-mesh session counts against a route-reflector design and size the sessions each RR carries.
ECMP DistributionCalculate how traffic is load-balanced across equal-cost multi-path routes.
EIGRP MetricCalculate the composite EIGRP metric from bandwidth, delay, reliability and load.
Failover Time CalculatorWork out failover time from BFD or hello timers plus switchover, and turn it into packet loss and yearly downtime.
LDP Session CalculatorSize LDP sessions, label bindings and hello load across an MPLS core using liberal label retention.
Longest Prefix MatchDetermine which routing table entry wins for a destination using longest prefix match.
MPLS LSP CalculatorCount the LSPs a PE mesh needs, the label space they consume and the RSVP-TE refresh load they generate.
MPLS MTU CalculatorSize core MTU for an MPLS label stack at 4 bytes per label, including VPN and entropy labels.
Next Hop CalculatorDetermine the next-hop gateway for a destination based on the routing table entries.
OSPF Area PlannerSplit an OSPF domain into areas and size each LSDB, showing what stub and totally-stubby areas filter out.
OSPF CostCalculate OSPF interface cost from link bandwidth using the reference bandwidth formula.
OSPF Neighbor CalculatorCount OSPF adjacencies on any network type and see how much DR/BDR election cuts against a full mesh.
Policy-Based Routing CalculatorEstimate matched traffic, ACE evaluations and CPU cost when PBR runs in hardware versus in software.
Recursive Route CalculatorTrace recursive next-hop resolution depth, its control-plane cost and the platform recursion limit.
RIP MetricCalculate the RIP hop-count metric for a route and check it against the maximum hop limit.
Route Flap CalculatorApply BGP flap damping: accumulate penalty per flap, compare to the suppress limit and get the suppression time.
Route Lookup CalculatorRun longest prefix match over four candidate routes and see exactly which one forwards a given destination.
Route SummarizationSummarize multiple contiguous routes into the smallest covering supernet.
Routing Convergence CalculatorAdd up detection, flooding, SPF and FIB installation to get end-to-end routing convergence and the worst term.
Routing Health Score CalculatorScore routing health from convergence, table utilisation, flap rate, session state and path redundancy.
Routing Table SizeEstimate memory and entry requirements for a routing table given prefix counts.
Segment Routing SID CalculatorDerive prefix-SID labels from an SRGB base and index, and check SRGB utilisation across the domain.
SR-MPLS CalculatorCheck an SR-MPLS label stack against platform MSD and MTU, and compare state held versus RSVP-TE.
Static Route CalculatorBuild a static route from a destination and prefix, and see whether its administrative distance beats the dynamic protocol.
VRF Capacity CalculatorSize VRFs against platform route and VRF limits, with RIB memory and the resource that caps you first.
VRF Route Leaking CalculatorMeasure how much route leaking between VRFs amplifies the routing table under hub, mesh or selective policy.