Configuring Layer 2 Tunneling For Etherchannels - Cisco Catalyst 3550 series Software Configuration Manual

Chapter 15 Configuring 802.1Q and Layer 2 Protocol Tunneling
Switch# show l2protocol
COS for Encapsulated Packets: 7
Port
------- -------- --------- --------- ------------- ------------- -------------
Fa0/11

Configuring Layer 2 Tunneling for EtherChannels

To configure Layer 2 point-to-point tunneling to facilitate the automatic creation of EtherChannels, you
need to configure both the SP edge switch and the customer switch.
Configuring the SP Edge Switch
Beginning in privileged EXEC mode, follow these steps to configure a SP edge switch for Layer 2
protocol tunneling for EtherChannels:
Command
Step 1 configure terminal
Step 2
interface interface-id
Step 3 switchport mode dot1q-tunnel
Step 4
l2protocol-tunnel point-to-point
[pagp | lacp | udld]
Step 5
l2protocol-tunnel
shutdown-threshold [point-to-point
[pagp | lacp | udld]] value
78-11194-09
Protocol Shutdown Drop
Threshold Threshold Counter
cdp 1500
stp 1500
vtp 1500
pagp ----
lacp ----
udld ----
Purpose
Enter global configuration mode.
Enter interface configuration mode, and enter the interface to be configured
as a tunnel port. This should be the edge port in the SP network that
connects to the customer switch. Valid interfaces are physical interfaces.
Configure the interface as an 802.1Q tunnel port.
(Optional) Enable point-to-point protocol tunneling for the desired
protocol. If no keyword is entered, tunneling is enabled for all three
protocols.
Caution
(Optional) Configure the threshold for packets-per-second accepted for
encapsulation. The interface is disabled 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.
Note
Encapsulation Decapsulation Drop
Counter
1000 2288 2282
1000 116 13
1000 3 67
---- 0 0
---- 0 0
---- 0 0
To avoid a network failure, make sure that the network is a
point-to-point topology before you enable tunneling for PAgP,
LACP, or UDLD packets.
If you also set a drop threshold on this interface, the
shutdown-threshold value must be greater than or equal to the
drop-threshold value.
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring Layer 2 Protocol Tunneling
Counter
0
0
0
0
0
0
15-13