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发表于 2008-7-17 13:04:47
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今天又看了一遍2960、3560文档关于span的部分,摘录如下:
第一段:
Only traffic that enters or leaves source ports or traffic that enters or leaves source VLANs can be
monitored by using SPAN; traffic routed to a source VLAN cannot be monitored. For example, if
incoming traffic is being monitored, traffic that gets routed from another VLAN to the source VLAN
cannot be monitored; however, traffic that is received on the source VLAN and routed to another VLAN
can be monitored.
第二段:
VLAN-based SPAN (VSPAN) is the monitoring of the network traffic in one or more VLANs. The SPAN
or RSPAN source interface in VSPAN is a VLAN ID, and traffic is monitored on all the ports for that
VLAN
VSPAN has these characteristics:
* All active ports in the source VLAN are included as source ports and can be monitored in either or
both directions
第三段:
SPAN interacts with these features:
* Routing—SPAN does not monitor routed traffic. VSPAN only monitors traffic that enters or exits
the switch, not traffic that is routed between VLANs. For example, if a VLAN is being
Rx-monitored and the switch routes traffic from another VLAN to the monitored VLAN, that traffic
is not monitored and not received on the SPAN destination port.
我还是不能理解下面这句话,谁能解释一下?
Traffic routed to source ports or source VLANs cannot be monitored
第三段,
1、进出交换机的可以被monitor
2、(在交换机内?)路由到源VLAN的不能被monitor
3、一个源VLAN,实际的源是属于该VLAN的各个端口,路由到源VLAN的traffic最后不也是要从该VLAN的某些端口出去吗? |
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