Configuring PortChannel LACP PAgP

2/21/2014 Configuring PortChannel LACP PAgP

http://freeccnplab.com/2012/10/14/configuring-portchannel-lacp-pagp/ 1/8

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Configuring PortChannel LACP PAgP

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Posted by barry on October 14th, 2012

On most Cisco switches it is possible to create logical connections that are made-up off different physical interface. It is

required that these interfaces share the same speed.

Most Cisco switches support a maximum of 64 EtherChannels. These interfaces do not need to be contiguous, or even within

the same module. Each channel must be made up of a minimum of 2, and a maximum of 8 interfaces. Best practice is to use

groups of 2, 4 or 8 interfaces. This will provide optimum load-balancing.

The load-balancing can be bases on layer 2, 3 or 4 information. Having different load-balancing methods for different

EtherChannels on a single switch is not permitted. Changes to the load-balancing method are applicable for all EtherChannels.

The load-balancing method can be:

src-mac

dst-mac

src-dst-mac

src-ip

dst-ip

src-dst-ip

src-port

dst-port

src-dst-port

Objective:

The objective of this lab is to understand and learn to configure EtherChannel (http://freeccnplab.com/2012/08/11/free-ccnp-lab-

configuring-etherchannel/), Link Aggregation Control Protocol (LACP), and Port Aggregation Protocol (PAgP). In this lab we will

use Ciscos Packet Tracer to configure multiple EtherChannels and implement LACP and PAgA between four Cisco Catalyst

switches.

LACP:

Link aggregation is a computer networking term to describe various methods of combining (aggregating) multiple network

connections in parallel to increase throughput beyond what a single connection could sustain, and to provide redundancy in

Cisco Lab Cisco ASA Cisco IOS Cisco 3750



case one of the links fails.

Link aggregation addresses two problems with Ethernet connections: bandwidth limitations and lack of resilience.

With regard to the first issue: bandwidth requirements do not scale linearly. Ethernet bandwidths historically have increased by

an order of magnitude each generation: 10 Megabit/s, 100 Mbit/s, 1000 Mbit/s, 10,000 Mbit/s. If one started to bump into

bandwidth ceilings, then the only option was to move to the next generation which could be cost prohibitive. An alternative

solution, introduced by many of the network manufacturers in the early 1990s, is to combine two physical Ethernet links into

one logical link via channel bonding. Most of these solutions required manual configuration and identical equipment on both

sides of the aggregation.

The second problem involves the three single points of failure in a typical port-cable-port connection. In either the usual

computer-to-switch or in a switch-to-switch configuration, the cable itself or either of the ports the cable is plugged into can fail.

Multiple physical connections can be made, but many of the higher level protocols were not designed to failover completely

seamlessly.

PAgP:

Port Aggregation Protocol (PAgP) is a Cisco Systems proprietary networking protocol, which is used for the automated, logical

aggregation of Ethernet switch ports, known as an EtherChannels. This means it can only be used between Cisco switches

and/or switches from licensed vendors. A similar purpose protocol known as LACP, released by the IEEE known as 802.3ad, is

an industry standard and is not tied to any specific vendor.

PAgP can be configured on a Cisco switch to operate in three different modes.

auto: Passive negotiation of the channel.

desirable: Active negotiation of the channel.

on: No protocols are used, it assumes the other side has also enabled link aggregation.

PAgP aids in the automatic creation of EtherChannel (http://freeccnplab.com/2012/08/11/free-ccnp-lab-configuring-

etherchannel/) links. PAgP packets are sent between EtherChannel (http://freeccnplab.com/2012/08/11/free-ccnp-lab-

configuring-etherchannel/)-capable ports in order to negotiate the formation of a channel. Some restrictions are deliberately

introduced into PAgP. The restrictions are:

PAgP does not form a bundle on ports that are configured for dynamic VLANs. PAgP requires that all ports in the channel

belong to the same VLAN (http://freeccnplab.com/2012/08/10/free-ccnp-lab-vlans-vtp-dtp-stp/) or are configured as trunk ports.

When a bundle already exists and a VLAN (http://freeccnplab.com/2012/08/10/free-ccnp-lab-vlans-vtp-dtp-stp/) of a port is

modified, all ports in the bundle are modified to match that VLAN (http://freeccnplab.com/2012/08/10/free-ccnp-lab-vlans-vtp-dtp-

stp/).

PAgP does not group ports that operate at different speeds or port duplex. If speed and duplex change when a bundle exists,

PAgP changes the port speed and duplex for all ports in the bundle.

PAgP modes are off, auto, desirable, and on. Only the combinations auto-desirable, desirable-desirable, and on-on allow the

formation of a channel. The device on the other side must have PAgP set to on if a device on one side of the channel does not

support PAgP, such as a router.

PAgP Configuration Example:

Switch# configure terminal

Switch(config)# interface range fastethernet 0/4 5 (Note: Spaces are mandatory.)

Switch(config-if)# no switchport

Switch(config-if)# no IP address

Switch(config-if)# channel-group 1 mode [auto/desirable/on]

Switch(config-if)# end



Perform Basic Router Configuration as follows:

1. Configure the hostname on all routers and switched as shown in the network diagram.

2. Configure no ip domain-lookup on all routers and switches.

3. Configure the enable secret password as cisco on all routers and switches.

4. Configure the console and vty password as sanfran on all routers and switches.

5. Configure the exec-timeout command to the console and virtual terminal lines.

6. Save the running configuration to the NVRAM.

Configure VTP (http://freeccnplab.com/2012/08/10/free-ccnp-lab-vlans-vtp-dtp-stp/) on all switches:

1. Configure all switches to be part of the VTP (http://freeccnplab.com/2012/08/10/free-ccnp-lab-vlans-vtp-dtp-stp/) domain

CCNP with the password of cisco.

2. Configure all switches to run VTP (http://freeccnplab.com/2012/08/10/free-ccnp-lab-vlans-vtp-dtp-stp/) version 2.

3. Configure switches DSW1 and DSW2 as VTP (http://freeccnplab.com/2012/08/10/free-ccnp-lab-vlans-vtp-dtp-stp/)

servers (http://freeccnplab.com/2014/02/18/adding-host-computers-gns3-labs/).

4. Configure switches ASW1 and ASW2 as VTP (http://freeccnplab.com/2012/08/10/free-ccnp-lab-vlans-vtp-dtp-stp/)

clients.

Configure EtherChannel (http://freeccnplab.com/2012/08/11/free-ccnp-lab-configuring-etherchannel/) trunks on the switches as

shown in the network diagram. Only switches DSW1 and DSW2 should actively initiate channel establishment; switches

ASW1 and ASW2 should be configured as passive links that should not actively attempt to establish an EtherChannel

(http://freeccnplab.com/2012/08/11/free-ccnp-lab-configuring-etherchannel/). The EtherChannels should be configured as follows:

The two ports between DSW1 and DSW2 belong to channel group (http://freeccnplab.com/2012/08/11/free-ccnp-lab-

configuring-etherchannel/) 1 and use mode on.

The two ports between DSW1 and ASW1 belong to channel group (http://freeccnplab.com/2012/08/11/free-ccnp-lab-

configuring-etherchannel/) 2 and use LACP.


configuring-etherchannel/) 3 and use PAgP.


configuring-etherchannel/) 4 and use LACP.


configuring-etherchannel/) 5 and use PAgP.

Configure VLANs:

1. On DSW1 VLANs 10, 20, 30, and 40.

2. Confirm that the above VLANs have propagated to all switches.

3. Assign port connecting PCs and Servers (http://freeccnplab.com/2014/02/18/adding-host-computers-gns3-labs/) to

VLANs as shown in the network diagram.

Spanning Tree Configuration:

1. Configure DSW1 as the primary Root Bridge for all VLANs.

2. Configure DSW2 as the secondary Root Bridge for all VLANs.

Download this lab now:

Configuring PortChannel (http://freeccnplab.com/download/17/) (330.4 KiB, 1,052 hits)

Recommend this on Google (http://addthis.com/bookmark.php?v=250)

Cisco IOS Cisco 3750 Cisco CCNP Used Cisco



Posted in EtherChannel (http://freeccnplab.com/category/switching/etherchannel/), Switching

(http://freeccnplab.com/category/switching/) Tags: CCNP

(http://freeccnplab.com/tag/ccnp/), Cisco (http://freeccnplab.com/tag/cisco/),

EtherChannel (http://freeccnplab.com/tag/etherchannel/), Lab

(http://freeccnplab.com/tag/lab/), LACP (http://freeccnplab.com/tag/lacp/), Packet Tracer (http://freeccnplab.com/tag/packet-

tracer/), PAgP (http://freeccnplab.com/tag/pagp/), PortChannel (http://freeccnplab.com/tag/portchannel/), Scenario

(http://freeccnplab.com/tag/scenario/), Switching (http://freeccnplab.com/tag/switching/), VLAN (http://freeccnplab.com/tag/vlan/)

Free CCNP Lab Configuring EtherChannel (http://freeccnplab.com/2012/08/11/free-ccnp-lab-configuring-etherchannel/)

EIGRP ODR Multi-Technology (http://freeccnplab.com/2012/10/27/eigrp-odr-multi-technology/)

You can leave a response (#respond), or trackback (http://freeccnplab.com/2012/10/14/configuring-portchannel-lacp-

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4 Responses to Configuring PortChannel LACP PAgP

1. ifffiwarsi says:

January 27, 2013 at 1:55 am (http://freeccnplab.com/2012/10/14/configuring-portchannel-lacp-pagp/#comment-

89)

Can I have privillage access password

Reply (/2012/10/14/configuring-portchannel-lacp-pagp/?replytocom=89#respond)

barry says:

February 10, 2013 at 11:14 am (http://freeccnplab.com/2012/10/14/configuring-portchannel-lacp-

pagp/#comment-97)

cisco


Kris says:

May 9, 2013 at 9:29 pm (http://freeccnplab.com/2012/10/14/configuring-portchannel-lacp-

pagp/#comment-108)

What version of packet tracer did you use to open the file?


barry says:

May 28, 2013 at 12:25 am (http://freeccnplab.com/2012/10/14/configuring-portchannel-lacp-

pagp/#comment-109)

Version 5.3.3.0019


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Configuring PortChannel LACP PAgP