CCNP R&S Question of the Week: EtherChannel

Which set of configurations will result in the member ports on switch 1 and 2 to bundling into an EtherChannel?

A. Switch1(inf-range)# channel-group 1 mode active
Switch2(inf-range)# channel-group 1 mode auto

B. Switch1(inf-range)# channel-group 1 mode desirable
Switch2(inf-range)# channel-group 1 mode passive

C. Switch1(inf-range)# channel-group 1 mode on
Switch2(inf-range)# channel-group 1 mode auto

D. Switch1(inf-range)# channel-group 1 mode desirable
Switch2(inf-range)# channel-group 1 mode auto

Reveal Answer

Answer: D.

With Etherchannel negotiations, the protocol configuration fallowing to try to bring up a channel:

PaGP:    Auto to Auto – no channel
Auto to Desirable – channel
Desirable to Desirable – channel

LACP:    Passive to Passive – no channel
Passive to Active – channel
Active to Active – channel

No protocol (ON):
On to On is the only valid combination, anything else will cause the member links to fail.

 

Related Courses
ROUTE – Implementing Cisco IP Routing v2.0
SWITCH – Implementing Cisco IP Switched Networks v2.0
TSHOOT – Troubleshooting and Maintaining Cisco IP Networks v2.0

Related Certification
CCNP Routing and Switching

CCNP R&S Question of the Week Series

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• CCNP R&S Question of the Week: BGP Attribute
• CCNP R&S Question of the Week: Gateway of Last Resort
• CCNP R&S Question of the Week: Routing Protocols into OSPF
• CCNP R&S Question of the Week: BPDU Guard
• CCNP R&S Question of the Week: Private VLANs
• CCNP R&S Question of the Week: Blocking to Forwarding State
• CCNP R&S Question of the Week: FTP to HTTP
• CCNP R&S Question of the Week: Alerts
• CCNP R&S Question of the Week: Configuration Sequence
• CCNP R&S Question of the Week: TCP Traffic
• CCNP R&S Question of the Week: IPv4 and IPv6
• CCNP R&S Question of the Week: clear ip route
• CCNP R&S Question of the Week: IPv6 Traffic Filter Impact
• CCNP R&S Question of the Week: EtherChannel

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