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 1Step 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-channelStep 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
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
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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