Configuring The Customer Switch - Cisco Catalyst 3550 series Software Configuration Manual

Configuring Layer 2 Protocol Tunneling
Command
Step 6 l2protocol-tunnel drop-threshold
[point-to-point [pagp | lacp | udld]]
value
Step 7
no cdp enable
Step 8 spanning-tree bpdufilter enable
Step 9
exit
Step 10
errdisable recovery cause l2ptguard (Optional) Configure the recovery mechanism from a Layer 2
Step 11
l2protocol-tunnel cos value
Step 12
end
Step 13
show l2protocol
Step 14 copy running-config startup-config
Use the no l2protocol-tunnel [point-to-point [pagp | lacp | udld]] interface configuration command to
disable point-to-point protocol tunneling for one of the Layer 2 protocols or for all three. Use the no
l2protocol-tunnel shutdown-threshold [point-to-point [pagp | lacp | udld]] and the no
l2protocol-tunnel drop-threshold [[point-to-point [pagp | lacp | udld]] commands to return the
shutdown and drop thresholds to the default settings.

Configuring the Customer Switch

After configuring the SP edge switch, begin in privileged EXEC mode and follow these steps to
configure a customer switch for Layer 2 protocol tunneling for EtherChannels:
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3 switchport trunk encapsulation
dot1q
Step 4 switchport mode trunk
Step 5 udld enable
Catalyst 3550 Multilayer Switch Software Configuration Guide
15-14
Chapter 15
Purpose
(Optional) Configure the threshold for packets-per-second accepted for
encapsulation. The interface drops packets if the configured threshold is
exceeded. If no protocol option is specified, the threshold applies to each of
the tunneled Layer 2 protocol types. The range is 1 to 4096. The default is
to have no threshold configured.
If you also set a shutdown threshold on this interface, the
Note
drop-threshold value must be less than or equal to the
shutdown-threshold value.
Disable CDP on the interface.
Enable BPDU filtering on the interface.
Return to global configuration mode.
maximum-rate error so that the interface is re-enabled and can try again.
Errdisable recovery is disabled by default; when enabled, the default time
interval is 300 seconds.
(Optional) Configure the CoS value for all tunneled Layer 2 PDUs. The
range is 0 to 7; the default is the default CoS value for the interface. If none
is configured, the default is 5.
Return to privileged EXEC mode.
Display the Layer 2 tunnel ports on the switch, including the protocols
configured, the thresholds, and the counters.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enter the interface configuration mode. This should be the customer switch
port.
Set the trunking encapsulation format to 802.1Q.
Enable trunking on the interface.
Enable UDLD in normal mode on the interface.
Configuring 802.1Q and Layer 2 Protocol Tunneling
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