EdgeRouter - Equal-Cost Multi Path (ECMP) Routing
2023-02-14 00:24:04 UTC
EdgeOS supports Equal-Cost Multi Path (ECMP) routing. Assuming multiple routes exist for the same destination network, with same prefix and administrative distance, traffic will be balanced equally between the links.
NOTES & REQUIREMENTS:
Applicable to the latest EdgeOS firmware on all EdgeRouter models. Please see the Related Articles below for more information.
ECMP Routing Example
The following example shows a default route (0.0.0.0/0) configured with two next-hop addresses. The EdgeRouter balances between the two routes in a round-robin fashion when using the EdgeOS v1.7.0 firmware and higher. On the v1.6.0 firmware version and lower the router balances the traffic in a flow-hash manner.
CLI: Access the Command Line Interface (CLI). You can do this using the CLI button in the GUI or by using a program such as PuTTY.
Verify the routing table output with the show ip route command:
show ip route
Codes: K - kernel route, C - connected, S - static, R - RIP, O - OSPF,
I - ISIS, B - BGP, > - selected route, * - FIB route
S>* 0.0.0.0/0 via 203.0.113.1, eth0
* via 192.0.2.1, eth1
The show ip route summary command will show the ECMP statistics.
show ip route summary
IP routing table name is Default-IP-Routing-Table(0)
IP routing table maximum-paths : 8
Total number of IPv4 routes : 20
Total number of IPv4 paths : 24
Route Source Networks
ECMP statistics (active in ASIC):
Total number of IPv4 ECMP routes : 4
Total number of IPv4 ECMP paths : 8
Number of routes with 2 ECMP paths : 4
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