LAG and ECMP Hashing
Page 134 7750 SR Interface Configuration Guide
Through this CLI hierarchy, S-tag is implicitly associated with the inter-dest-string and
consequently with the Vport.
Link Placement
This feature requires that all active member ports in a LAG reside on the same forwarding
complex (IOM/IMM).
Multicast Consideration
Multicast traffic that is directly replicated per subscriber follows the same hashing algorithm as the
rests of the subscribers (per inter-dest-string hashing).
Multicast traffic that is redirected to a regular Layer 3 interface outside of the ESM will be hashed
per destination group (or IP address).
VPLS and Capture SAP Considerations
VPLS environment in conjunction with ESM allows hashing based on destination mac address.
This is achieved through the following CLI hierarchy:
configure
service vpls <vpls-id>
sap lag-<id>
sub-sla-mgmt
mac-da-hashing
Note: This is only applicable to L2 ESM. In the case where this is configured AND Vport hashing
is desired, the following order of evaluation will be executed:
1. Hashing based on subscriber-id or inter-dest-string
2. If configured, mac-da-hashing
Hashing per inter-dest-string will win if <Vport, subscriber> association is available at the same
time as the mac-da-hashing is configured.
Mac-da-hashing mechanism cannot transition from capture SAP to a derived MSAP.
LSR Default Hash Routine— Label-Only Hash Option
The following is the behavior of ECMP and LAG hashing at an LSR in the existing
implementation. These are performed in two rounds.
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