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.