Objectives
The simulator ticks each one as soon as the network meets it.
Enable feature lacp on N1 and N2.
Put Ethernet1/3-4 in channel-group 10 mode active on both switches.
Make port-channel10 a trunk carrying VLAN 10 (switchport trunk allowed vlan 10) on both switches.
show port-channel summary shows Po10(SU) with both members (P).
Ping PC2 (192.168.10.20) from PC1.
Before you start
On NX-OS "channel-group N mode active" needs feature lacp; mode on works without it but sends no LACP. A range is part of the name: interface ethernet1/3-4. Configure the members first, then the port-channel.
Concept
EtherChannel / Eth-Trunk with LACP
Link aggregation bundles parallel links into one logical link. Spanning tree then sees a single port, so all links forward at once instead of one being blocked, and traffic moves to the remaining links if one fails.
Concept
802.1Q trunks: VLAN tags on the wire
A trunk carries many VLANs over one link. To keep them apart, the sending switch inserts a 4-byte 802.1Q tag into each frame saying which VLAN it belongs to; the receiving switch reads the tag and removes it before delivering the frame to an access port.
