📖 What is Port Aggregation Protocol (PAgP)?
A Cisco-proprietary protocol for EtherChannel creation that automatically groups links with similar characteristics.
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Sensei Says:
"PAgP uses 'Desirable' and 'Auto' modes. Like LACP, at least one side must be Desirable to form the channel. For the CCNA, know the difference between LACP (standard) and PAgP (Cisco)."
📚 Certification: Certified Network Associate (200-301)
🔑 What are the Key Concepts of Port Aggregation Protocol (PAgP)?
- ▸ Cisco-proprietary link aggregation protocol
- ▸ Modes: Desirable (initiates) and Auto (listens)
- ▸ Only supported on Cisco devices
🎯 How does Port Aggregation Protocol (PAgP) appear on the 200-301 Exam?
Choosing the correct protocol to bundle links between two legacy Cisco Catalyst switches.
Identifying the mismatch when one side is configured for PAgP Desirable and the other is LACP Active.
❓ Frequently Asked Questions
What are the active and passive modes called in PAgP?
Desirable (active) and Auto (passive).
Can you mix PAgP and LACP on the same EtherChannel link?
No, both sides of the bundle must use the same negotiation protocol.