LACP is the industry standard on port-channel protocol. Like PaGP is also support dynamic
creation of Etherchannels.
If you mean by fixed type is no negotiation, This would mean there is no etherchannel protocol but just forcing to "on". "on" mode would be no PAGP nor LACP since no negotiation protocol is sent out by an "on" channel.
So, PaGP = Cisco, LaCP = industry standard.
LACP supports the automatic creation of EtherChannels by exchanging LACP packets between LAN ports. LACP packets are exchanged only between ports in passive and active modes.
The protocol learns the capabilities of LAN port groups dynamically and informs the other LAN ports. Once LACP identifies correctly matched Ethernet links, it facilitates grouping the links into an EtherChannel. The EtherChannel is then added to the spanning tree as a single bridge port.
Both the passive and active modes allow LACP to negotiate between LAN ports to determine if they can form an EtherChannel, based on criteria such as port speed and trunking state. Layer 2 EtherChannels also use VLAN numbers.
how is the actual link in the LACP bundle, selected for passsing user traffic? by mac address? IP or session? if i monitor all the links participating in the etherchannel, will the traffic from one host to a server (let's say) go through the same "cable" or it will be splitted among all the physical links? what about returning traffic? I am planning to "sniff" the traffic on a LACP link, and i wanted to make sure i can capture all the traffic in the right order, from a layer 7 point of view.
In an EtherChannel, a single frame is always carried over a single link in the bundle. The choice of a particular link in the bundle is not related to the LACP or PAgP. These protocols only negotiate the creation of an EtherChannel, but once the EtherChannel is established, the choice of a particular link is performed by the switch alone. This choice is commonly based on addressing information in the frame: source/destination MAC, IP, L4 ports or even higher-level protocol, or combination thereof. Usually, you can configure your switch to use a particular set of these addressing fields to choose a particular link. Each device on either end of an EtherChannel bundle can use a different load-balancing mechanism.
On a Catalyst 3560, you can choose from these fields:
SW-Dist1(config)#port-channel load-balance ?
dst-ip Dst IP Addr
dst-mac Dst Mac Addr
src-dst-ip Src XOR Dst IP Addr
src-dst-mac Src XOR Dst Mac Addr
src-ip Src IP Addr
src-mac Src Mac Addr
It is important to understand that a single flow (i.e. the same source/destination MACs, IPs, L4 protocol and ports) will be carried over a single link. Therefore, a single flow (e.g. a download from a server) will not experience any performance improvement. Only an aggregate flow of many flows will get distributed over different links in the EtherChannel bundle and achieve an increase in aggregated throughput.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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