What is channel group mode desirable?
on means force channelling on, but do not negotiate with the other side. desirable means try and negotiate with the other side, and if he agrees, then enable the channel. If you have on on one side and desirable on the other, then it will not form a channel because no negotiation will take place.
What are the modes of LACP?
There are a few LACP modes: “active”, “passive” and “on”. Switch(config)#interface port-channel 5 Then you need to assign the physical ports and specify LACP mode.
What are the modes of PAgP?
There are two modes of PAgP:
- Auto mode: it passively negotiates PAgP aggregation. If the remote end of the link is also configured with Auto mode, a PAgP EtherChannel will not form.
- Desirable mode:that actively negotiates PAgP. The remote end must be configured in Auto or Desirable mode for a PAgP EtherChannel to form.
What is the difference between EtherChannel auto and desirable modes?
What is the difference between EtherChannel auto and desirable modes? Desirable will always initiate autonegotiation, whereas auto will not. Auto will always initiate autonegotiation, whereas desirable will not. Auto will always try to negotiate to an access port first before trying other modes.
What is the channel group 1 mode active?
Channel-group mode active means that LACP will be enabled on the LAG. You would have trouble with this if the other side is not configured for LACP as well. You do not need to use LACP in order for the LAG to work with VLAG or any other protocol really.
What are the two modes you can set with LACP?
LACP has two modes, i.e., Active mode (Ports initiate negotiation with other ports by exchanging LACP packets.) and Passive Mode (Ports reply to the received LACP packets but it doesn’t initiate LACP.).
What are the three types of PAgP interface modes?
Cisco implementation PAgP can be configured on a Cisco switch to operate in three different modes: auto – passive negotiation of the channel. desirable – active negotiation of the channel.
What is the difference between EtherChannel auto and desirable modes quizlet?
What is better PAgP or LACP?
Besides, LACP can support cross-stack, while PAGP does not since it does not support participating interfaces on different physical switches. Thus if you need to form the Etherchannel on stack switch, it is better to choose LACP instead of PAGP.
What does Switchport Nonegotiate mean?
switchport nonegotiate: Prevents the interface from generating DTP frames. You can use this command only when the interface switchport mode is access or trunk. You must manually configure the neighboring interface as a trunk interface to establish a trunk link.
What is the difference between Layer 2 and Layer 3 EtherChannel?
Layer 2 EtherChannel bundles access or trunk ports between switches or other devices (e.g., servers). Layer 3 EtherChannel bundles routed ports between switches.
Why is LACP needed?
LACP, a subcomponent of IEEE 802.3ad, provides additional functionality for link aggregation groups (LAGs). Use the link aggregation feature to aggregate one or more Ethernet interfaces to form a logical point-to-point link, known as a LAG, virtual link, or bundle.
What is dynamic desirable mode?
This is the default mode for some switchports. Dynamic Desirable — Makes the port actively attempt to convert the link to a trunk link. The port becomes a trunk port if the neighboring Ethernet port is set to trunk, dynamic desirable or dynamic auto mode.
Which mode is compatible with trunk access and desirable?
In that case both “dynamic auto” and “dynamic desirable” mode are correct.
What is the difference between Channel-Group 1 mode on/desirable?
Re: Channel-group 1 mode on / desirable. on means force channelling on, but do not negotiate with the other side. desirable means try and negotiate with the other side, and if he agrees, then enable the channel. If you have on on one side and desirable on the other, then it will not form a channel because no negotiation will take place.
What is the range for Channel-group-number and mode?
For channel-group-number, the range is 1 to 26. This number must be the same as the port-channel-number (logical port) configured in the “Creating Port-Channel Logical Interfaces” section . For mode, select one of these keywords:
What is the recommended trunk mode when connecting two Cisco switches?
The above is taken verbatim from one of the catalyst presentations and yes “desirable” is the recommended trunk mode when connecting two Cisco switches. Nash 0 Helpful Reply
What is the difference between desirable mode and ether channel mode?
Thanks. Solved! Go to Solution. 05-06-2012 01:41 PM 05-06-2012 01:41 PM Unfortunately, the above poster had some wrong information. While “desirable” is a DTP negotiation mode, it is also a ether channel mode. There are two protocols for ether channel negotiation.