Huawei quidway s7700 - Page 514

Figure 10-5 Networking diagram for multiple rings running SEP
LSW1
LSW2
LSW3
LSW4
LSW5
Block Port
NPE1
NPE2
IP/MPLS Core
SEP
Segment 1
LSW6
LSW7
LSW8
LSW10 LSW11
LSW12
LSW13
LSW14
LSW9
Access
Aggregation
Core
SEP
Segment 2
SEP
Segment 3
SEP
Segment 4
SEP
Segment 5
VRRP+peer BFD
As shown in Figure 10-5, LSW1 to LSW14 form multiple rings. LSW1 to LSW5 are at
the aggregation layer, and LSW6 to LSW14 are at the access layer. Layer 2 services are
transparently transmitted at the access layer and the aggregation layer. SEP runs at the
aggregation layer and access layer to implement link redundancy. If the topology of a SEP
segment at the access layer changes, a node in the SEP segment sends a Flush-FDB packet
to instruct the other nodes in the SEP segment to refresh their MAC address forwarding
tables and ARP tables. The edge devices in the SEP segment send TC packets to notify
devices at the upper layer that the topology of the SEP segment has changed.
In multi-ring networking, topology change notification among ring networks needs to be
configured.
l Hybrid networking
– Hybrid SEP+MSTP 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.
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