What is unconditional EtherChannel?
Ether-Channel technology gives you the ability to “bundle” multiple physical links into a single logical link. The first one which is the most common for port density aggregation from switch to switch is called called an “unconditional” or static EtherChannel. From a technical perspective; the mode is “on”.
What are the constraints that should be taken into consideration in order to have a successful EtherChannel Aggregation?
These are:
- EtherChannel bundle links must be of the same type and speed.
- All links intended to be bundled MUST NOT exceed the number of eight physical links.
- All links MUST belong to the same VLAN if used as access links.
How many ports can EtherChannel logically bundle?
eight
EtherChannel can have up to eight similar ports in a bundle and a switch can have multiple port-channels. Proper EtherChannel creation requires all ports within the bundle to be configured similarly and to have similar operation status. Both ends of an EtherChannel require similar configuration as well.
What is the maximum number of interfaces that can be aggregated with EtherChannel?
For a PAgP EtherChannel, you can configure up to eight ports of the same type and speed for the same group. For a LACP EtherChannel, you can configure up to 16 Ethernet ports of the same type. Up to eight ports can be active, and up to eight ports can be in standby mode.
What is EtherChannel Cisco?
EtherChannel is a port link aggregation technology or port-channel architecture used primarily on Cisco switches. It allows grouping of several physical Ethernet links to create one logical Ethernet link for the purpose of providing fault-tolerance and high-speed links between switches, routers and servers.
Which combinations of PAgP modes will form an EtherChannel choose all that apply?
Explanation: The combinations of modes that will form an EtherChannel are as follows: on/on, active/passive, active/active, desirable/auto, and desirable/desirable.
What are some of the restrictions of an EtherChannel?
A limitation of EtherChannel is that all the physical ports in the aggregation group must reside on the same switch except in the case of a switch stack, where they can reside on different switches on the stack.
What is the maximum number of interfaces that can be aggregated with EtherChannel and Lacp?
We can configure LACP EtherChannel with a maximum of 16 Ethernet interfaces of the same type. In a LAG or Link Aggregation Group, up to eight member links can be in active mode, and the other eight links can be in standby mode.
What is the maximum number of ports supported for virtual switch links?
The virtual switching system supports a maximum of 128 EtherChannels on one VSS.
Can You statically configure an EtherChannel using LACP?
Statically configuring an EtherChannel (“on”) imposes no delay yet can cause serious problems if not properly configured at both ends. To configure an EtherChannel using LACP negotiation, each side must be set to either active or passive; only interfaces configured in active mode will attempt to negotiate an EtherChannel.
Which is a consideration when implementing etherchannels?
Another consideration to make when implementing EtherChannels is the type of load-balancing in effect. EtherChannel provides load-balancing only per frame, not per bit. A switch decides which member link a frame will traverse by the outcome of a hash function performed against one or more fields of each frame.
How are multiple links grouped in an EtherChannel?
With EtherChannel configured, multiple links are grouped into a port-channel, which is assigned its own configurable virtual interface. The bundle is treated as a single link. An EtherChannel can be established using one of three mechanisms:
How does EtherChannel provide load balancing per frame?
EtherChannel provides load-balancing only per frame, not per bit. A switch decides which member link a frame will traverse by the outcome of a hash function performed against one or more fields of each frame. Which fields are considered is dependent on the switch platform and configuration.