Port Features
Page 80
7750 SR OS Interface Configuration Guide
The forwarding behavior of the nodes abide by the following principles. Note that logical
destination (actual forwarding decision) is primarily determined by the service (VPLS or VLL)
and then principle below applies only if destination or source is based on MC-LAG:
•
Packets received from the network will be forwarded to all local active links of the given
destination-sap based on conversation hashing. In case there are no local active links, the
packets will be cross-connected to inter-chassis pseudowire.
•
Packets received from the MC-LAG sap will be forwarded to active destination pseudo-
wire or active local links of destination-sap. In case there are no such objects available at
the local node, the packets will be cross-connected to inter-chassis pseudowire.
MC-LAG and Subscriber Routed Redundancy Protocol (SRRP)
MC-LAG and SRRP enables dual-homed links from any IEEE 802.3ad standards-based access
device (for example, a IP DSLAM, Ethernet switch or a Video on Demand server) to multiple
Layer 2 or Layer 3 aggregation nodes. In contrast with slow recovery mechanisms such as
Spanning Tree, multi-chassis LAG provides synchronized and stateful redundancy for VPN
services or triple play subscribers in the event of the access link or aggregation node failing, with
zero impact to end users and their services.
Refer to the 7750 SR OS Triple Play Guide for information about SRRP.
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