How to configure layer 2 etherchannel with pagp

Layer 2 Etherchannel With Pagp networkingguruji1.com/2020/01/layer-2-etherchannel-with-pagp.html

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Previous post: - Configuring Layer 2 Etherchannel…. Click here Toady Dissuasion only…. Pagp – Port aggregation Protocol (Cisco Proprietary)

Etherchannel Verification Etherchannel can be configured in two ways, you can configure statically or you can rely on Negotiation protocol, that will do the negotiation and will from port-channel. In the previous example, we have seen how we can configure EtherChannel statically. Now we will see how 1/7

we can configure EtherChannel with negotiation protocol. In cisco device following two protocols are used for the negotiation.

Pagp ---- Port Aggregation Protocol (Cisco Proprietary) Lacp ---- Link Aggregation Protocol (IEEE 802.3ad or open standard) Etherchannel Modes in Switches: Mode On Negotiation Protocol None Explanation Enable Etherchannel unconditionally. Recommended if the workstation/server does not support any negotiation protocols.

Mode Off Negotiation Protocol None Explanation Disable Etherchannel unconditionally.

Mode Active Negotiation Protocol LACP Explanation Initiates negotiation by sending LACP packets. Recommended if the workstation/server support LACP. Mode 2/7

Passive Negotiation Protocol LACP Explanation If remote end sends LACP packets, negotiation will start.

Mode Desirable Negotiation Protocol Pagp Explanation Initiates negotiation by sending pagp packets. Recommended if the workstation/server support pagp.

Mode Auto Negotiation Protocol Pagp Explanation If removed end sends pagp packets, negotiation will start.

In this section, we are using Etherchannel negotiation protocol pagp, which is cisco property and modes are desirable and auto.

CCNA Etherchannel PAGP Configuration Configure SW-4 port fa0/1 and fa0/5 with dynamic desirable mode.

Configure SW-2 port fa0/1 and fa0/3 with dynamic auto mode.

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Configure EtherChannel to use pagp on SW-2 and SW-4 using port fa0/1 and fa0/5 The port-channel number should be 42 SW-4 should imitate the negotiation and SW-2 should respond.

Etherchannel pagp Configuration SW-2 SW-2(config)#interface fastethernet0/1 SW-2(config-if)#no channel-group 24 mode on SW-2(config)#interface fastethernet0/3 SW-2(config-if)#no channel-group 24 mode on SW-2(config-if)#no interface port-channel 24 SW-4 SW-4(config)#interface fastethernet0/1 SW-4(config-if)#no channel-group 24 mode on SW-4(config)#interface fastethernet0/5 SW-4(config-if)#no channel-group 24 mode on 4/7

SW-4(config-if)#no interface port-channel 24 SW-2 SW-2(config)#interface fastethernet0/1 SW-2(config-if)#channel-group 42 mode auto SW-2(config)#interface fastetehrnet0/3 SW-2(config-if)#channel-group 42 mode auto SW-4 SW-4(config)#interface fastethernet0/1 SW-4(config-if)#channel-group 42 mode desirable SW-4(config)#interface fastetehrnet0/5 SW-4(config-if)#channel-group 42 mode desirable Note: - Pagp is using Desirable and auto, these are not DTP mode. DTP also use desirable and auto.

SW-4# show EtherChannel summary Flags: D – down p – bundled in port-channel I – stand-alone s – suspended H – Hot standby (LACP) only R – layer 3 S - later 2 U – in Use F – Failed to allocate aggregator M – not in use, minimum links not met U – Unsuitable for building W- waiting to be aggregated D – default port Number of channel-groups in use: 1 Number of aggregators: 1 Group 42

port-channel po42(Su)

Protocol pagp

ports fa0/1(P)

fa0/5(P)

SW-2# show EtherChannel summary Flags: D – down p – bundled in port-channel I – stand-alone s – suspended H – Hot standby (LACP) only R – layer 3 S – later 2 5/7

U – in Use F – Failed to allocate aggregator M – not in use, minimum links not met U – Unsuitable for building W- waiting to be aggregated D – default port Number of channel-groups in use: 1 Number of aggregators: 1 Group 42

port-channel po42(Su)

Protocol pagp

ports fa0/1(P)

fa0/3(P)

Sw-4# Show interface trunk Port

Mode

Encapsulation

Po24

desirable

Port Po24

VLAN allowed on trunk 1-1005

Port Po24

n-isl

Status

Native VLAN

trunking

1

VLANs allowed and active in management domain 1,10,20,30 6/7

Port Po24

VLANs in spanning tree forwarding state and not pruned 1,10,20,30

Sw-2# Show interface trunk Port Po24 Port Po24

Mode auto

Encapsulation Status n-isl trunking

Native VLAN 1

VLAN allowed on trunk 1-1005

Port Po24

VLANs allowed and active in management domain 1,10,20,30

Port Po24

VLANs in spanning tree forwarding state and not pruned 1,10,20,30

“EtherChannel L2 PAGP” On the above output, since SW-4-member interface (physical interface) were in dynamic desirable mode, newly created the port-channel interface copy the attribute and start negotiating with another end of the switch, which is SW-2. And Sw-2 members interface (physical interfaces) were configured in dynamic auto mode, created port-channel interface copy this attribute and respond to the negotiation, as result portchannel interface has become trunk.

Note:- “EtherChannel PAGP” The channel-group number may not be the same on the switches, it can be different. It is basically logically significant.

This is a full article “Layer 2 Etherchannel with pagp” Thank you so much.

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