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You are here: Home / SWITCH / Module 5 / Etherchannels and Link Aggregation Protocols – Port Aggregation Protocol Overview

Etherchannels and Link Aggregation Protocols – Port Aggregation Protocol Overview

Port Aggregation Protocol (PAgP) is a Cisco proprietary link aggregation protocol that enables the automatic creation of EtherChannels. By default, PAgP packets are sent between EtherChannel-capable ports in order to negotiate the forming of an EtherChannel. These packets are sent to the destination Multicast MAC address 01-00-0C-CC-CC-CC, which is also the same Multicast address that is used by CDP, UDLD, VTP, and DTP.  Figure 5-2  below shows the fields contained within a PAgP frame as seen on the wire:

Fig. 5-2. PAgP Ethernet Header

Although going . . .

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