Hi everybody.
I came up some question on different topics related to ccnp switch's curriculum.
Etherchannel:
Cisco documents say Cisco uses proprietary hashing algorithm to compute a binary pattern that selects a link in the bundle.
For example below a 2961 router with a switch module " NM-16ESW" performs" XOR" operation to compute the binary value to select a link.
R1#show etherchannel load-balance
Po1 ---> Source XOR Destination IP address
1)Would you guys share the output " show etherchannel load-balance" on your platforms?( i just want to see how different platform support different algorithm besides xor)
Layer 3 etherchannel on a sw.
On router, we first create etherchannel and then assign int into port channel.
Suppose we have a layer 3 switch and we want to put ports f1/1-2 in port channel 1. Can i configure like this:
sw(con) int range f1/1-2
no switchport
channel-group 1 mode desirable.
Or we must create a port channel just like we do on router and then assign ports to port channel?
Backbone fast:
Suppose we have a switch with three ports, f1/1.f1/2.f1/3.
f1/1 ( root port)
f1/2( blocking)
f1/3 ( designated port).
Backbone fast is enabled on our network. Suppose sw receives a inferior bpdu on its currect root port f1/1. Sw sends out RLQ on its designated port(f1/2) and Blocked port (f1/3). Suppose sw receives the rlq reply on its designated port ( f1/2).
What will sw do? Will it expire the max-age timer on its root port ( f1/1) or will sw wait for all the rlq responses then expire the max-age timer on its root port ( f1/1) ?
thanks and have a great weekend.
