Zte ZXR10 2920, Руководство пользователя

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ZXR10 2920/2928/2952
(V1.0)
Access Switch User Manual
（
Volume I
）
210 Confidential and Proprietary Information of ZTE CORPORATION
zte(cfg)#show sflow
Agent address :192. 168. 1. 1
Collector address:192. 168. 1. 2
Ingress:
Reload Mode: Continuous
Sample Mode: All
PortId Port Freq CPU Freq Counter
------ ---------- ---------- ---------
1 20000 None 18459
Egress:
Reload Mode: Continuous
PortId Port Freq CPU Freq Counter
------ ---------- ---------- ---------
2 20000 None 19998
zte(cfg)#
When counter of port is decreased to 0, data packets coming
into port will be sampled to cpu. When port does not link up,
value of counter is 0.
ZESR Overview
There is disadvantage of STP; its convergence speed is slow.
To make up for it, and considering that most of core networks
are annular and each switch has two ports to link into the ring in
this topology structure, so it only needs to block a port in ring
to avoid loop. When link trouble occurs, free the port from
blocked to protect the service flow.
ZTE Ethernet Switching Ring supports fast convergence well
when the topology of ring Ethernet link changes. ZESR is a
master switch in an annular network, and others are transits.
Each switch has two port connected into ring, and one of the
port is designated as primary port, other as secondary port.
Master switch sends ring detection frames to detect whether
loop is good. When loop is good, master switch blocks its
secondary port. When master switch detects that loop is down,
it turns its secondary port into forwarding state, which ensures
loop to be normal.
Figure 36 shows the typical network of ZESR. S1 is master,
and other switches are transits. Master has a primary port and
a secondary port in ring. When loop is good, secondary port
on master is blocked. When loop is down, master turns on its
secondary port.
Disadvantage
of STP
ZESR features