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Equal Cost Multi-Path | 333
In Figure 14-1, Core Router 1 is an E-Series TeraScale and Core Router 2 is an E-Series ExaScale. They
have similar configurations and have routes for prefix P with two possible next-hops. When Deterministic
ECMP is enabled and the hash algorithm and seed are configured the same, each flow is consistently sent
to the same next hop even though they are routed through two different chassis.
Figure 14-1. Deterministic ECMP Next Hop + Configurable Hash Algorithm Seed
Task Command Syntax Command Mode
Specify the hash algorithm seed. hash-algorithm seed value [linecard number]
[port-set number]
Range: 0 - 4095
CONFIGURATION
Backbone router
Prefix: P
Next-hop 1Next-hop 1 Next-hop 2
Core Router 1
TeraScale
Core Router 2
ExaScale
F
l
ow A
Flow
B