Huawei quidway s7700 - Page 513

As shown in Figure 10-3, the networking consists of the access layer, aggregation layer,
and core layer. The CE is dual-homed to the upstream Layer 2 network through LSW1 to
LSW5. LSW1 to LSW5 form an open ring network. The open ring network is deployed at
the access layer to implement Layer 2 transparent transmission of unicast and multicast
packets. SEP runs at the access layer to implement link redundancy.
On a closed ring network, an edge interface is deployed on each of the two edge devices.
l Closed ring network
Figure 10-4 Networking diagram for a closed ring running SEP
LSW1
LSW2
LSW3
LSW4
LSW5
CE1
NPE1
NPE2
IP/MPLS Core
CE2 CE3
SEP
Segment
Access
Aggregation
Core
Block Port
Primary Edge Node
Secondary Edge Node
VRRP+peer BFD
As shown in Figure 10-4, the CEs are dual-homed to the upstream Layer 2 network through
LSW1 to LSW5. The edge devices LSW1 and LSW5 are directly connected to each other.
LSW1 to LSW5 form a closed ring network. The closed ring network is deployed at the
aggregation layer to aggregate unicast and multicast services. SEP runs at the aggregation
layer to implement link redundancy.
On a closed ring network, two edge interfaces are deployed on one edge device.
l Multiple-ring networking
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 10 SEP Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
496