Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 125
3.2.14.3.5 Ingress Port
The use-ingress-port option, when enabled, specifies that the ingress port will be
used by the hashing algorithm at the LSR. This option should be enabled for ingress
LAG ports because packets with the same label stack can arrive on all ports of a LAG
interface. In this case, using the ingress port in the hashing algorithm will result in
better egress load balancing, especially for pseudowires.
The option should be disabled for LDP ECMP so that the ingress port is not used by
the hashing algorithm. For ingress LDP ECMP, if the ingress port is used by the
hashing algorithm, the hash distribution could be biased, especially for pseudowires.
3.2.14.4 Layer 4 Load Balancing
The IP Layer 4 load-balancing option includes the TCP/UDP source and destination
port numbers in addition to the source and destination IP addresses in per-flow
hashing of IP packets. By including the Layer 4 information, a source
address/destination address default hash flow can be subdivided into multiple
finer-granularity flows if the ports used between a source address and destination
address vary.
Layer 4 load balancing is configured at the system level using the
config>system>l4-load-balancing command. It can also be configured at the
router interface level or the service interface level (IES and VPRN). Configuration at
the router interface or service interface level overrides the system-level configuration
for the specified interface or service.
For LSR LDP ECMP, Layer 4 load balancing is configured using the lbl-ip-l4-teid
option in the lsr-load-balancing command at the system level or router interface
level. Configuration at the router interface level overrides the system-level
configuration for the specified interface.
Layer 4 load balancing can also be configured at the service level for Epipe and
VPLS services. Layer 4 load balancing at the service level is not impacted by Layer 4
load balancing at the system, router interface, or service interface levels.
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