Cisco Systems WSC4500X16SFP Manual De Usuario
5-11
Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter 5 Checking Port Status and Connectivity
Configuring ICMP
These examples show how to use the traceroute mac and traceroute mac ip commands to display the
physical path a packet takes through the network to reach its destination:
physical path a packet takes through the network to reach its destination:
Switch# traceroute mac 0000.0201.0601 0000.0201.0201
Source 0000.0201.0601 found on con6[WS-C2950G-24-EI] (2.2.6.6)
con6 (2.2.6.6) :Fa0/1 => Fa0/3
con5 (2.2.5.5 ) : Fa0/3 => Gi0/1
con1 (2.2.1.1 ) : Gi0/1 => Gi0/2
con2 (2.2.2.2 ) : Gi0/2 => Fa0/1
Destination 0000.0201.0201 found on con2[WS-C3550-24] (2.2.2.2)
Layer 2 trace completed
Switch#
Switch# traceroute mac ip 2.2.66.66 2.2.22.22 detail
Translating IP to mac .....
2.2.66.66 => 0000.0201.0601
2.2.22.22 => 0000.0201.0201
Source 0000.0201.0601 found on con6[WS-C2950G-24-EI] (2.2.6.6)
con6 / WS-C2950G-24-EI / 2.2.6.6 :
Fa0/1 [auto, auto] => Fa0/3 [auto, auto]
con5 / WS-C2950G-24-EI / 2.2.5.5 :
Fa0/3 [auto, auto] => Gi0/1 [auto, auto]
con1 / WS-C3550-12G / 2.2.1.1 :
Gi0/1 [auto, auto] => Gi0/2 [auto, auto]
con2 / WS-C3550-24 / 2.2.2.2 :
Gi0/2 [auto, auto] => Fa0/1 [auto, auto]
Destination 0000.0201.0201 found on con2[WS-C3550-24] (2.2.2.2)
Layer 2 trace completed.
Switch#
Configuring ICMP
Internet Control Message Protocol (ICMP) provides many services that control and manage IP
connections. ICMP messages are sent by routers or access servers to hosts or other routers when a
problem is discovered with the Internet header. For detailed information on ICMP, refer to RFC 792.
connections. ICMP messages are sent by routers or access servers to hosts or other routers when a
problem is discovered with the Internet header. For detailed information on ICMP, refer to RFC 792.
Enabling ICMP Protocol Unreachable Messages
If the Cisco IOS software receives a nonbroadcast packet that uses an unknown protocol, it sends an
ICMP Protocol Unreachable message back to the source.
ICMP Protocol Unreachable message back to the source.
Similarly, if the software receives a packet that it is unable to deliver to the ultimate destination because
it knows of no route to the destination address, it sends an ICMP Host Unreachable message to the
source. This feature is enabled by default.
it knows of no route to the destination address, it sends an ICMP Host Unreachable message to the
source. This feature is enabled by default.
Command
Purpose
Switch# traceroute mac ip {
source-mac-address}
{
destination-mac-address}
Runs IP traceroute to trace the path that
packets take through the network.
packets take through the network.