Stack Packets; Stack Packet Header - Huawei S Series White Paper

S Series Switches
iStack Technology White Paper
Disadvantages
Recommended
scenarios

2.2 Stack Packets

The stack packet format varies slightly according to the version. The following uses the stack
packet format in V200R003 as an example.

2.2.1 Stack Packet Header

Table 2-2 Stack packet header
0 1 2 3 4 5 6 7
Dst MAC [4]
Dst MAC [2]
Src MAC [4]
VLAN Tag
EthType 0x5100
ProtoType
SrcFPort
SrcStackId
DesStackId
Length
Packet Data
Issue 01 (2013-05-25)
Ring Topology
Does not apply to
long-distance stacking
because the member
devices need to be
physically connected to
each other.
To ensure reliability, the
ring topology is
recommended in scenarios
where the distance between
member devices is short.
0 1 2 3 4 5 6 7
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
2 Technology Description
Chain Topology
Provides low reliability. When a stack
link fails, the stack cannot work properly
and some devices cannot work.
The entire stack has only one path,
reducing the stack link bandwidth usage.
The chain topology is recommended in
scenarios where the distance between
member devices is long because the ring
topology is difficult to deploy.
0 1 2 3 4 5 6 7
Src MAC [2]
Version
Resv
Resv
0 1 2 3 4 5 6 7
11