ECMP (Equal-Cost Multipath Routing) Configuration
- Tracy Yang
NOTE:
- Enable IP routing function before using this feature, for details please refer to Configuring IP Routing.
- IPv6 static ECMP routing is not supported.
In L2/L3, ECMP is supported. The maximum ECMP outgoing port group is 4*128. If each ECMP route is configured to have up to 4 equal-cost paths, for example, the maximum ECMP outgoing port group support is 128. If each ECMP route is configured to have up to 16 equal-cost paths, the maximum ECMP outgoing port group support is 32. Several different ECMP routes can share the same outgoing port group. After configuring the ECMP equal-cost path maximum, reboot the switch to make it available.
Configuring the Equal-Cost Path Maximum
admin@XorPlus# set interface ecmp path_max 8 admin@XorPlus# commit Waiting for merging configuration. Commit OK. Save done. ECMP max path changes, please reset the box! admin@XorPlus# run request system reboot The system is going down NOW! Sending SIGTERM to all processes Sending SIGKILL to all processes Requesting system reboot Restarting system. rstcr compatible register does not exist! uses the mpc8541's gpio to do a reset. U-Boot 1.3.0 (Sep 8 2010 - 17:20:00) CPU: 8541, Version: 1.1, (0x80720011) Core: E500, Version: 2.0, (0x80200020) Clock Configuration: CPU: 825 MHz, CCB: 330 MHz, DDR: 165 MHz, LBC: 41 MHz L1: D-cache 32 kB enabled I-cache 32 kB enabled I2C: ready DRAM: Initializing
Configuring Static ECMP Routing
admin@XorPlus# set vlans vlan-id 2 admin@XorPlus# set vlans vlan-id 3 admin@XorPlus# set vlans vlan-id 4 admin@XorPlus# set interface gigabit-ethernet ge-1/1/3 family ethernet-switching native-vlan-id 2 admin@XorPlus# set interface gigabit-ethernet ge-1/1/4 family ethernet-switching native-vlan-id 3 admin@XorPlus# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching native-vlan-id 4 admin@XorPlus# set vlans vlan-id 2 l3-interface vlan-2 admin@XorPlus# set vlans vlan-id 3 l3-interface vlan-3 admin@XorPlus# set vlans vlan-id 4 l3-interface vlan-4 admin@XorPlus# set l3-interface vlan-interface vlan-2 address 10.10.60.10 prefix-length 24 admin@XorPlus# set l3-interface vlan-interface vlan-3 address 10.10.61.10 prefix-length 24 admin@XorPlus# set l3-interface vlan-interface vlan-4 address 10.10.62.10 prefix-length 24 admin@XorPlus# commit Waiting for merging configuration. Commit OK. Save done. admin@XorPlus# set protocols static route 10.10.51.0/24 next-hop 10.10.61.20 admin@XorPlus# set protocols static route 10.10.51.0/24 next-hop 10.10.62.20 admin@XorPlus# commit Waiting for merging configuration. Commit OK. Save done.
Check the static ECMP route for 10.10.51.0/24 in the RIB with command run show route ipv4.
Configuring ECMP Hash Fields
In the default setting, all fields are hashed by IP-source, port-destination, port-source, and VLAN. Additional fields can be enabled, as shown below:
admin@XorPlus# set interface ecmp hash-mapping field ingress-interface disable false admin@XorPlus# set interface ecmp hash-mapping field ip-destination disable false admin@XorPlus# set interface ecmp hash-mapping field ip-protocol disable false admin@XorPlus# set interface ecmp hash-mapping field ip-source disable false admin@XorPlus# set interface ecmp hash-mapping field port-destination disable false admin@XorPlus# set interface ecmp hash-mapping field port-source disable false admin@XorPlus# set interface ecmp hash-mapping field vlan disable false admin@XorPlus# commit Waiting for merging configuration. Commit OK. Save done. admin@XorPlus#
Configuring ECMP Hash Mode
When you configure ECMP hash mode, follow these restrictions and guidelines:
Dynamic Load Balancing for ECMP is only supported on Trident3 and Tomahawk3 platforms.
When the ECMP hash-mapping mode configuration (set/delete) changes, a system reboot is required for the configuration to take effect.
ECMP hash-mapping modes (round-robin-load-balancing, randomized-load-balancing, symmetric and dlb-normal) are mutually exclusive. To switch between modes, you must first delete the configured mode before setting up the new one. Then, restart the system for the configuration to take effect.
Enable Randomized Load Balancing for ECMP.
admin@PICOS# set interface ecmp hash-mapping randomized-load-balancing admin@PICOS# commit admin@PICOS# exit admin@PICOS> request system reboot
Enable round robin mode of ECMP load balancing.
admin@PICOS# set interface ecmp hash-mapping round-robin-load-balancing admin@PICOS# commit admin@PICOS# exit admin@PICOS> request system reboot
Enable normal mode of Dynamic Load Balancing for ECMP.
admin@PICOS# set interface ecmp hash-mapping dlb-normal admin@PICOS# commit admin@PICOS# exit admin@PICOS> request system reboot
Enable Symmetric Hash for ECMP.
admin@PICOS# set interface ecmp hash-mapping symmetric true admin@PICOS# commit admin@PICOS# exit admin@PICOS> request system reboot
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