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Note See the "Understanding How SPAN and RSPAN
Work" section for concepts and terminology that
apply to both SPAN and RSPAN configuration.
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RSPAN has all the features of SPAN (see the
"Understanding How SPAN Works" section), plus
support for source ports and destination ports
that are distributed across multiple switches,
allowing remote monitoring of multiple switches
across your network.
The traffic for each RSPAN session is carried
over a user-specified RSPAN VLAN that is
dedicated for that RSPAN session in all
participating switches. The SPAN traffic from
the sources is copied onto the RSPAN VLAN
through the reflector port and then forwarded
over trunk ports carrying the RSPAN VLAN to
RSPAN destination ports monitoring the RSPAN
VLAN.
Traffic sent out through the source port is also
sent out on the reflector port. Because the
reflector port is an access (nontrunking) port
in loopback mode, the traffic is switched out
with no VLAN tag and is immediately sent back to
the switch. In the loopback, the traffic is
encoded into the RSPAN VLAN. A switch with an
RSPAN destination session receives the traffic
(see Figure 26-2).
The traffic type for sources (ingress, egress,
or both) in an RSPAN session can be different
for source switches, but must be the same for
all source ports on a given switch.
Do not configure any ports in an RSPAN VLAN
except those selected to carry RSPAN traffic.
Learning is disabled on the RSPAN VLAN.
Figure 26-2 Flow of RSPAN Monitored Traffic
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本文来自ChinaUnix博客,如果查看原文请点:http://blog.chinaunix.net/u/27493/showart_482219.html |
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