PingingLab-3.14 basic L2 Etherchannel Configuration

3.14 L2 Etherchannel basic configuration

Purpose:

1. master the basic configurations of L2 Etherchannle.

2. Understand the Etherchannel negotiation protocol.

Tutorial topology:

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Tutorial steps:

1. Deploy L2 etherchannels on SW1 and SW2 Based on the topology shown in the figure to bind links and provide link bandwidth. You can deploy L2 etherchannels in three ways:

① Forced mode: bind directly without any negotiation.

② Pagp mode: negotiate through the Cisco private protocol Pagp.

③ Lacp: negotiation is conducted through the industry standard protocol Lacp.

2. Deploy L2 Etherchannel in force mode. The configuration is as follows:

On SW1

SW1 (config) # int range f0/1-2

SW1 (config-if-range) # switchport trunk encapsulation dot1q

SW1 (config-if-range) # switchport mode trunk

SW1 (config-if-range) # channel-group 1 mode on [PL1]

SW1 (config-if-range) # exit

On SW2

SW2 (config) # int range f0/1-2

SW2 (config-if-range) # switchport trunk encapsulation dot1q

SW2 (config-if-range) # switchport mode trunk

SW2 (config-if-range) # channel-group 1 mode on

SW2 (config-if-range) # exit

View the Ethernet channel information as follows:

SW1 # show etherchannel summary

Flags:D-downP-in port-channel

I-stand-alone s-susponded

H-Hot-standby (LACP only)

R-Layer3S-Layer2

U-in useF-failed to allocate aggregator

U-unsuitable for bundling

W-waiting to be aggregated

D-default port

Number of channel-groups in use: 1

Number of aggregators:1

GroupPort-channelProtocolPorts

------ + ------------- + ----------- + ----------------------------------------------

1Po1 (SU)-Fa0/1 (P) Fa0/2 (P)

At this time, the Ethernet channel has been successfully established to view the physical information of the Ethernet channel, as shown below:

SW1 # show interfaces port-channel 1

Port-channel1 is up, line protocol is up

Hardware is EtherChannel, address is cc03.0a28. f000 (bia cc03.0a28. f000)

MTU 1500 bytes, BW 200000 Kbit, DLY 1000 usec,

Reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100 Mb/s

Members in this channel: Fa0/0 Fa0/1

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:01, output never, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 input packets with dribble condition detected

0 packets output, 0 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

We can see that the bandwidth of the Ethernet channel is 200 MB.

3. Use Pagp for negotiation and binding. The configuration is as follows:

On SW1

SW1 (config) # int range f0/1-2

SW1 (config-if-range) # switchport trunk encapsulation dot1q

SW1 (config-if-range) # switchport mode trunk

SW1 (config-if-range) # channel-protocol pagp [PL2]

SW1 (config-if-range) # channel-group 1 mode desirable [PL3]

On SW2

SW2 (config) # int range f0/1-2

SW2 (config-if-range) # switchport trunk encapsulation dot1q

SW2 (config-if-range) # switchport mode trunk

SW2 (config-if-range) # channel-protocol pagp

SW2 (config-if-range) # channel-group 1 mode auto

View the Ethernet channel status as follows:

SW1 # show etherchannel summary

Flags:D-downP-in port-channel

I-stand-alone s-susponded

H-Hot-standby (LACP only)

R-Layer3S-Layer2

U-in useF-failed to allocate aggregator

U-unsuitable for bundling

W-waiting to be aggregated

D-default port

Number of channel-groups in use: 1

Number of aggregators:1

GroupPort-channelProtocolPorts

------ + ------------- + ----------- + ----------------------------------------------

1Po1 (SU)PAgPFa0/1 (P) Fa0/2 (P)

We can see that L2 Etherchannel binding is implemented through the PagP protocol, and Lacp can also be used, which is skipped here. This experiment is complete.

[PL1]Put F0/1 and F0/2 into group1, where group is the local identifier, used to distinguish multiple local bundle groups.

[PL2]The PAGP or LACP protocol can be used.

[PL3]PAGP has desirable and auto modes, and LACP has active and passive modes.

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