How to Configure PAgP EtherChannel in Cisco Packet Tracer

In Cisco networking, EtherChannel offers a method to bundle multiple physical Ethernet links into a single logical link, providing increased bandwidth and redundancy.

One of the key aspects of configuring EtherChannel is selecting the appropriate mode, with one option being the Port Aggregation Protocol (PAgP), a Cisco proprietary protocol.

This blog post will guide you on how Configure Port Aggregation Protocol (PAgP) EtherChannel in Cisco Switches.

Network Topology

The network topology we will be making use of in this post is shown below. As you can see, it consists of two switches joined together using two straight-through cables.
In this demonstration, we will configure Port Aggregation Protocol (PAgP) on each of the switches so that the two links can be aggregated into one link with a higher bandwidth.

How to Configure PAgP EtherChannel in Cisco Switches

Here are steps to configure PAgP EtherChannel in Cisco Switchs in packet tracer;

Step 1: Configure PAgP on SW1

Access the interface configuration mode for the range of Ethernet ports intended for EtherChannel configuration on SW1. Use the channel-group 1 mode desirable command to enable PAgP negotiation.

SW1(config)#interface range fa0/1-2
SW1(config-if-range)#channel-group 1 mode desirable
SW1(config-if-range)#
Creating a port-channel interface Port-channel 1

Step 2: Configure PAgP on SW2

Similarly, on SW2, configure the same range of Ethernet ports for EtherChannel using PAgP mode. Use the channel-group 1 mode auto command to allow automatic negotiation.

SW2(config)#interface range fa0/1-2
SW2(config-if-range)#channel-group 1 mode auto
SW2(config-if-range)#
Creating a port-channel interface Port-channel

 Step 3: Verify Port channel Creation

Switch1

SW1(config)#do show ip interface brief
Interface              IP-Address      OK? Method Status                Protocol 
Port-channel1          unassigned      YES manual up                    up 
FastEthernet0/1        unassigned      YES manual up                    up 
FastEthernet0/2        unassigned      YES manual up                    up 
FastEthernet0/3        unassigned      YES manual down                  down 
FastEthernet0/4        unassigned      YES manual down                  down 
FastEthernet0/5        unassigned      YES manual down                  down 
FastEthernet0/6        unassigned      YES manual down                  down 
FastEthernet0/7        unassigned      YES manual down                  down 
FastEthernet0/8        unassigned      YES manual down                  down 
FastEthernet0/9        unassigned      YES manual down                  down 
FastEthernet0/10       unassigned      YES manual down                  down 
FastEthernet0/11       unassigned      YES manual down                  down 
FastEthernet0/12       unassigned      YES manual down                  down 
FastEthernet0/13       unassigned      YES manual down                  down 
FastEthernet0/14       unassigned      YES manual down                  down 
FastEthernet0/15       unassigned      YES manual down                  down 
FastEthernet0/16       unassigned      YES manual down                  down 
FastEthernet0/17       unassigned      YES manual down                  down 
FastEthernet0/18       unassigned      YES manual down                  down 
FastEthernet0/19       unassigned      YES manual down                  down 
FastEthernet0/20       unassigned      YES manual down      

 Switch 2

SW2(config)#do show ip interface brief
Interface              IP-Address      OK? Method Status                Protocol 
Port-channel1          unassigned      YES manual up                    up 
FastEthernet0/1        unassigned      YES manual up                    up 
FastEthernet0/2        unassigned      YES manual up                    up 
FastEthernet0/3        unassigned      YES manual down                  down 
FastEthernet0/4        unassigned      YES manual down                  down 
FastEthernet0/5        unassigned      YES manual down                  down 
FastEthernet0/6        unassigned      YES manual down                  down 
FastEthernet0/7        unassigned      YES manual down                  down 
FastEthernet0/8        unassigned      YES manual down                  down 
FastEthernet0/9        unassigned      YES manual down                  down 
FastEthernet0/10       unassigned      YES manual down                  down 
FastEthernet0/11       unassigned      YES manual down                  down 
FastEthernet0/12       unassigned      YES manual down                  down 
FastEthernet0/13       unassigned      YES manual down                  down 
FastEthernet0/14       unassigned      YES manual down                  down 
FastEthernet0/15       unassigned      YES manual down                  down 
FastEthernet0/16       unassigned      YES manual down                  down 
FastEthernet0/17       unassigned      YES manual down                  down 
FastEthernet0/18       unassigned      YES manual down                  down 
FastEthernet0/19       unassigned      YES manual down                  down 
FastEthernet0/20       unassigned      YES manual down                  down 

On SW1

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SW1(config)#do show etherchannel summary
Flags: D - down P - in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - 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
Group Port-channel Protocol Ports
------+-------------+-----------+----------------------------------------------
1 Po1(SU) PAgP Fa0/1(P) Fa0/2(P)

On SW2 

SW2(config)#do show etherchannel summary
Flags: D - down P - in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - 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
Group Port-channel Protocol Ports
------+-------------+-----------+----------------------------------------------
1 Po1(SU) PAgP Fa0/1(P) Fa0/2(P)

How to configure LACP etherchannel on Cisco switches  in packet tracer

ALSO READ:  How to Configure "GRE over IPSec Tunnel" on Cisco Routers (Site-to-Site)

How to Configure Etherchannel Load Balancing

Etherchannel Open Standard Protocol: LACP Configuration & Show Commands

How to Configure Layer 3 Etherchannel On Packet Tracer

Static EtherChannel Configuration

Reference: https://github.com/misterkrittin/CCNA-Labs

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