IGP Metric Calculator (OSPF / EIGRP / IS-IS)

OSPFEIGRPIS-IS

Compute path cost/metric for the three IGPs that actually use math to get there. Enter one hop per line for the links along your path.

Reference Bandwidth: Mbps

One hop's outgoing interface bandwidth per line. Bare numbers are Mbps; suffix with K or G for Kbps/Gbps (e.g. 1G, 1544K).

One hop per line: bandwidth_kbps,delay_microseconds. Common defaults — Ethernet: 10000,1000 · FastEthernet: 100000,100 · GigabitEthernet: 1000000,10 · T1: 1544,20000. Only the slowest bandwidth in the path and the sum of delays matter to the formula.

Advanced: K-values, load, reliability

K1 K2 K3 K4 K5

Load (1-255) Reliability (1-255)

Metric Style:

One link metric per line. Unlike OSPF, IS-IS doesn't derive metric from bandwidth by default — it's whatever you configure per interface (10 is the common flat default). This just sums the path and checks it against the style's limits.