Term
| How many links can be in a single EtherChannel? |
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Definition
| 2-8 links of FastEther, GigEther, or 10GEther. |
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Term
| When in non-trunk, all bundled ports must be on the same ______ to be in the same EtherChannel? |
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Definition
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Term
| What must happen on all ports to be bundled into the same trunk on an EtherChannel group? |
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Definition
| They must be in trunking mode, have the same native VLAN, and pass the same VLANs. |
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Term
| All ports bundled in EtherChannel should have identical settings for what? |
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Definition
| Speed, Duplex, and Spanning-Tree. |
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Term
| In EtherChannel frames are balance on the links according to ________? |
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Definition
| A hashing algorithm that can use; source IP, Destination IP, a combination of source/dest IP, source/dest MAC, or TCP/UDP port numbers. |
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Term
| The load balancing hashing algorithm can use what factors to load balance? |
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Definition
| source IP, Destination IP, a combination of source/dest IP, source/dest MAC, or TCP/UDP port numbers. |
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Term
| What logical operation is used by the hashing algorithm on the frame bits to decide on a link for load balancing? |
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Definition
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Term
| What method is the default for load balancing on Layer 3 with EtherChannel? |
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Definition
| source and destination IP, or 'src-dst-ip' |
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Term
| What are the 9 possible methods that can be used with the '#port-channel load-balance' command? |
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Definition
| scr-ip, dst-ip, src-dst-ip, src-mac, dst-mac, src-dst-mac, src-port, dst-port, src-dst-port. |
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Term
| What method is the default for load balancing on Layer 2 with EtherChannel? |
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Definition
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Term
| What are the two methods of negotiating bundled links in Cisco Switches? |
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Definition
| PAgP (Port Aggregation Protocol, Cisco proprietary) and LACP (Link Aggregation Control Protocol, Standards based). |
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Term
| What are the three operating modes for PAgP? |
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Definition
-On, does not negotiate
-Desirable(Active!) actively seeks to form a channel
-Auto(Passive!), the default, negotiates only if far end initiates it. |
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Term
| What does PAgP do if a configuration is made on a single port in the EtherChannel? |
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Definition
| It reconfigures all of the other ports to match the change. |
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Term
| What does IEEE 802.3ad define? |
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Definition
| LACP (Link Aggregation Control Protocol) |
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Term
| How many potential links does LACP allow for in a EtherChannel? |
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Definition
| It allows for 16, but only 8 are used at a time, chosen by their port priority value (lowest wins!) |
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Term
| What are the three operating modes for LACP? |
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Definition
-On, does not negotiate
-Active, actively seeks to form a channel
-Passive, negotiates only if far end initiates it. |
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Term
| What two commands must be placed on a switch port before it can become part of a EtherChannel group? |
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Definition
(if)
channel-protocol [PAgP/LACP]
channel-group # mode [on/auto/desirable] |
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Term
| On PAgP links, when should the non-silent command be added to the end of the 'channel-group' command? |
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Definition
| When you expect another PAgP-capable switch to be on the other end. This allows for more accurate information for the Spanning Tree Protocol. |
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Term
| What is the value range and default value of the LACP system-priority and port-priority? |
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Definition
| 1-65536, and the default is 32768. |
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Term
| What happens when two switches connected via EtherChannel and LACP have different LACP system priority values? the same values? |
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Definition
-If different, the system with the lowest value will make all decisions about the EtherChannel makeup.
-If the same, the switch with the lowest MAC address will make the decisions about the EtherChannel. |
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Term
| What is the command to change the LACP system priority value? |
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Definition
(Config)
lacp system-priority ##### |
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Term
| What is the command to change the LACP port priority value? |
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Definition
(if)
lacp port-priority ##### |
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Term
| If more than 8 ports are added to an LACP EtherChannel, what happens with the ports with high port-priority numbers? |
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Definition
| Lower port-priorities are made active ports in the group, and higher ones are placed into the standby status. |
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Term
| What are the only modes for PAgP and LACP that with exchange negotiation packets? |
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Definition
| Active/Desirable, and Passive/Auto. |
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Term
| If two ports are in the Passive/Auto mode for LACP and PAgP, will they establish a connection? |
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Definition
| No! they both wait for the other side to initiate! |
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Term
| What are the possible commands that can be added to 'show etherchannel' ? |
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Definition
| summary, port, port-channel, detail, load-balance. |
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Term
| What configuration step will turn a Layer 2 EtherChannel into a Layer 3 EtherChannel? |
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Definition
| Adding and IP address to the PortChannel interface. |
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