Both protocols are used for Link aggregarion, To bundle the links to get maximum throughput.
Its known as Link Aggregation | Etherchannel | NIC teaming
LACP is standard protocol you can make ether channel between
Cisco —————————- another vendor
PAGP - Port aggregation protocol is Cisco Proprietary, only runs in Cisco.
Regards
Port Aggregation Protocol (PAgP) Modes
Auto Mode: Auto mode in Port Aggregation Protocol (PAgP)) does not initiate the negotiation, but responds to Port Aggregation Protocol (PAgP) packets initiated by other end. Auto mode in Port Aggregation Protocol (PAgP) does not start Port Aggregation Protocol (PAgP) packet negotiation
Desirable mode: Desirable mode in Port Aggregation Protocol (PAgP) initiates the negotiation and tries to form EtherChannel with other end.
If you are using Port Aggregation Protocol (PAgP) for EtherChannel negotiation, EtherChannel will be formed only if two ends are configured under following modes.
Link Aggregation Control Protocol (LACP)
Active Mode: Active Mode in Link Aggregation Control Protocol (LACP) initiates the negotiation and tries to form EtherChannel with other end.
Passive Mode: Passive Mode in Link Aggregation Control Protocol (LACP) does not initiate the negotiation, but responds to Link Aggregation Control Protocol (LACP)packets initiated by other end. Passive Mode in Link Aggregation Control Protocol (LACP)does not start Link Aggregation Control Protocol (LACP) packet negotiation.
What is LACP?
This is Standards-based (IEEE 802.3ad) negotiation protocol. Link Aggregation Control Protocol, is used to dynamically build an EtherChannel. There are different modes of LACP.
1. Active: The active end of the group sends out a LACP frame and initiates the negotiation to form the EtherChannel. Both ends could be active and the result would be the same.
2. Passive: Passive Mode does not initiate the negotiation. It just responds to LACP packets initiated by other end. So if both ends were passive, the EtherChannel would not be formed.
What is PAgP?
This is Cisco proprietary negotiation protocol. Port Aggregation Protocol is used to achieve the same goal as LACP. PAgP has 2 modes:
1. Desirable: In this mode, the negotiation will be initiated by sending the special frames to form EtherChannel with the other end.
2. Auto: In this mode, negotiation is not initiated. It only responds to the special frames received for negotiation form the other end. So, if both ends are in Auto mode, EtherChannel would not be formed.
There is basically no difference between the two other than the names of the mode.
One thing to note is that there is no particular command to enable LACP or PAgP on a Cisco router. Instead, the mode names are used.
For example: If you use Desirable mode, then the router understands that you are implementing PAgP and if you use Active mode, the router will understand that you're trying to use LACP.
This is Standards-based (IEEE 802.3ad) negotiation protocol. Link Aggregation Control Protocol, is used to dynamically build an EtherChannel. There are different modes of LACP.
1. Active: The active end of the group sends out a LACP frame and initiates the negotiation to form the EtherChannel. Both ends could be active and the result would be the same.
2. Passive: Passive Mode does not initiate the negotiation. It just responds to LACP packets initiated by other end. So if both ends were passive, the EtherChannel would not be formed.
What is PAgP?
This is Cisco proprietary negotiation protocol. Port Aggregation Protocol is used to achieve the same goal as LACP. PAgP has 2 modes:
1. Desirable: In this mode, the negotiation will be initiated by sending the special frames to form EtherChannel with the other end.
2. Auto: In this mode, negotiation is not initiated. It only responds to the special frames received for negotiation form the other end. So, if both ends are in Auto mode, EtherChannel would not be formed.
There is basically no difference between the two other than the names of the mode.
One thing to note is that there is no particular command to enable LACP or PAgP on a Cisco router. Instead, the mode names are used.
For example: If you use Desirable mode, then the router understands that you are implementing PAgP and if you use Active mode, the router will understand that you're trying to use LACP.
1 comment:
nice blog CISCO Meraki Switches Firewall
Post a Comment