Ccna 00-301, Volume Official


Using PAgP channel-group 2 mode {active | passive



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CCNA 200-301 Vol 1&2

Using PAgP

channel-group 2 mode {active | passive}

channel-group 1 mode active

Using LACP

Begins


Negotiations

Figure 10-7

  Correct EtherChannel Configuration Combinations

Technet24

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ptg29743230

10

Chapter 10: RSTP and EtherChannel Configuration    251



NOTE

  Do not use the on parameter on one end, and either auto or desirable (or for LACP, 



active or passive) on the neighboring switch. The on option uses neither PAgP nor LACP, so 

a configuration that uses on, with PAgP or LACP options on the other end, would prevent 

the EtherChannel from working.

For example, in the design shown in Figure 10-7, imagine both physical interfaces on both 

switches were configured with the channel-group 2 mode desirable interface subcommand. 

As a result, the two switches would negotiate and create an EtherChannel. Example 10-5 

shows the verification of that configuration, with the command show etherchannel 1  

port-channel. This command confirms the protocol in use (PAgP, because the desirable 

keyword was configured), and the list of interfaces in the channel.



Example 10-5

  EtherChannel Verification: PAgP Desirable Mode

SW1# show etherchannel 1 port-channel

                 Port-channels in the group: 

                 ---------------------------

Port-channel: Po1

------------

Age of the Port-channel   = 0d:00h:04m:04s

Logical slot/port   = 16/1          Number of ports = 2

GC                  = 0x00020001      HotStandBy port = null

Port state          = Port-channel Ag-Inuse

Protocol            = PAgP

Port security       = Disabled

Load share deferral = Disabled  

Ports in the Port-channel:

Index   Load   Port     EC state        No of bits

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

  0     00     Gi0/1    Desirable-Sl       0

  0     00     Gi0/2    Desirable-Sl       0

Time since last port bundled: 0d:00h:03m:57s Gi0/2


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