CCNP switch slides 11 Flashcards
source
http://www.coursehero.com/flashcards/430737/CCNP-SWITCH-642-813-Aggregate-Links/
What is the value range and default value of the LACP system-priority and port-priority?
1-65536, and the default is 32768.
What are the two methods of negotiating bundled links in Cisco Switches?
PAgP (Port Aggregation Protocol, Cisco proprietary) and LACP (Link Aggregation Control Protocol, Standards based).
What happens when two switches connected via EtherChannel and LACP have different LACP system priority values? the same values?
-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.
The load balancing hashing algorithm can use what factors to load balance?
source IP, Destination IP, a combination of source/dest IP, source/dest MAC, or TCP/UDP port numbers.
What must happen on all ports to be bundled into the same trunk on an EtherChannel group?
They must be in trunking mode, have the same native VLAN, and pass the same VLANs.
What logical operation is used by the hashing algorithm on the frame bits to decide on a link for load balancing?
XOR
What are the three operating modes for PAgP?
-On, does not negotiate-Desirable(Active!) actively seeks to form a channel-Auto(Passive!), the default, negotiates only if far end initiates it.
In EtherChannel frames are balanced on the links according to ________?
A hashing algorithm that can use; source IP, Destination IP, a combination of source/dest IP, source/dest MAC, or TCP/UDP port numbers.
What two commands must be placed on a switch port before it can become part of a EtherChannel group?
(if)channel-protocol [PAgP/LACP]channel-group # mode [on/auto/desirable]
If more than 8 ports are added to an LACP EtherChannel, what happens with the ports with high port-priority numbers?
Lower port-priorities are made active ports in the group, and higher ones are placed into the standby status.
What are the 9 possible methods that can be used with the ‘#port-channel load-balance’ command?
scr-ip, dst-ip, src-dst-ip, src-mac, dst-mac, src-dst-mac, src-port, dst-port, src-dst-port.
How many links can be in a single EtherChannel?
2-8 links of FastEther, GigEther, or 10GEther.
What are the only modes for PAgP and LACP that with exchange negotiation packets?
Active/Desirable, and Passive/Auto.
What method is the default for load balancing on Layer 2 with EtherChannel?
source MAC, or src-mac
What are the three operating modes for LACP?
-On, does not negotiate-Active, actively seeks to form a channel-Passive, negotiates only if far end initiates it.
When in non-trunk, all bundled ports must be on the same ______ to be in the same EtherChannel?
VLAN
What are the possible commands that can be added to ‘show etherchannel’ ?
summary, port, port-channel, detail, load-balance.
What is the command to change the LACP system priority value?
(Config)lacp system-priority #####
How many potential links does LACP allow for in a EtherChannel?
It allows for 16, but only 8 are used at a time, chosen by their port priority value (lowest wins!)
What configuration step will turn a Layer 2 EtherChannel into a Layer 3 EtherChannel?
Adding and IP address to the PortChannel interface.
What method is the default for load balancing on Layer 3 with EtherChannel?
source and destination IP, or ‘src-dst-ip’
On PAgP links, when should the non-silent command be added to the end of the ‘channel-group’ command?
When you expect another PAgP-capable switch to be on the other end. This allows for more accurate information for the Spanning Tree Protocol.
If two ports are in the Passive/Auto mode for LACP and PAgP, will they establish a connection?
No! they both wait for the other side to initiate!
All ports bundled in EtherChannel should have identical settings for what?
Speed, Duplex, and Spanning-Tree.
What is the command to change the LACP port priority value?
(if)lacp port-priority #####
What does PAgP do if a configuration is made on a single port in the EtherChannel?
It reconfigures all of the other ports to match the change.
What does IEEE 802.3ad define?
LACP (Link Aggregation Control Protocol)
