Ethernet & Switching Calculators
26 free ethernet & switching calculators in Networking.
- 802.1Q Tag Overhead CalculatorMeasure what a 4-byte 802.1Q tag or an 8-byte QinQ stack costs in frame size, MTU and bandwidth.
- ARP Table CalculatorSize an ARP cache across VLANs and estimate the broadcast load its refresh cycle puts on every host.
- BPDU Timer CalculatorValidate STP hello, max-age and forward-delay timers against the IEEE inequalities and get the convergence time.
- Broadcast Domain CalculatorSplit hosts into broadcast domains and check the broadcast bandwidth every NIC in a domain has to absorb.
- Collision Domain CalculatorCount collision domains in a mixed switch and hub topology, with CSMA/CD slot time and cable diameter limits.
- Ethernet OverheadCalculate Ethernet framing overhead and its impact on effective throughput.
- Ethernet Throughput CalculatorTurn a line rate into real frame rate, Layer 2 throughput and TCP goodput after preamble, IFG, headers and FCS.
- Frame Check Sequence CalculatorSize the 4-byte Ethernet FCS, count the bits it protects and estimate how many corrupt frames slip past CRC-32.
- Frame Size CalculatorCalculate total Ethernet frame size including headers, payload and trailer.
- Interframe Gap CalculatorConvert the 96-bit Ethernet interframe gap into nanoseconds at any line rate and see the bandwidth it costs.
- Jumbo Frame CalculatorCalculate throughput and overhead gains from enabling jumbo frames on a link.
- LACP Distribution CalculatorCheck how evenly a LAG hash spreads flows across members and how much skew a non-power-of-two bundle causes.
- MAC Address ConverterConvert MAC addresses between colon, hyphen, dot and raw hex notations.
- MAC Table Size CalculatorSize a switch CAM table from host count and VLAN membership, and see how long before growth fills it.
- MAC Vendor LookupIdentify the hardware vendor associated with a MAC address OUI prefix.
- MSS CalculatorCalculate TCP maximum segment size from MTU and header overhead.
- MSTP Instance CalculatorMap VLANs onto MST instances and see how much spanning-tree state MSTP saves against per-VLAN spanning tree.
- MTU CalculatorCalculate the optimal maximum transmission unit for a network path.
- Port Channel Capacity CalculatorSize a LAG: aggregate bandwidth, capacity after a member fails and the single-flow ceiling hashing imposes.
- RSTP Path Cost CalculatorWork out 802.1D/802.1w port and root path costs using the long or short cost table, including aggregated links.
- STP CostCalculate Spanning Tree Protocol port cost based on link speed and STP version.
- Switch Utilization CalculatorCheck access-to-uplink oversubscription, uplink utilisation and whether the switch fabric is truly non-blocking.
- Trunk BandwidthCalculate the aggregate and per-VLAN bandwidth carried on an Ethernet trunk link.
- VLAN CalculatorPlan VLAN IDs, subnets and trunking assignments across switches.
- VLAN Capacity CalculatorFind whether the VLAN table or the STP logical-interface limit caps how many VLANs a switch can really carry.
- VLAN ID PlannerAllocate 802.1Q VLAN IDs across sites in aligned blocks and check the plan fits the 4094 usable IDs.