Either Channel Question

bravealikhan

Hi

I have two Cisco 2960 Switches (in lab environment, named as Sw1 & Sw2), I connected both switches via two Giga 0/1 & 0/2 with Cross over cable.

On Switch1 i did the following configuration to make an either channel:

Sw-1:

Config t
interface range giga 0/1 - 2
interface mode trunk
channel-group 1 mode desirable

One Sw-2

Config t
interface range giga 0/1 - 2
interface mode trunk
channel-group 1 mode desirable

When i see show ip interface bri on switch 1:

it show:

Giga 1 is up up
giga 2 is status up protocl down
port-channel1 up up

I have attached two screen shot of Show ip interface bri
and
show interface port-channel 1 etherchannel


I'll appreciate if someone guide how do i properly configure Etherchannel.... do i need to make a trunk link or either channel can work without trunking...

Thanks

Regards

Ali

Hondabuff

Here is the down and dirty way with enabling PAGP or LACP.

Switch>en
Switch#conf t
Switch(config)#int range gigabitEthernet 0/1 - 2
Switch(config-if-range)#shut

Switch(config-if-range)#
%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to administratively down
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to down
%LINK-5-CHANGED: Interface GigabitEthernet0/2, changed state to administratively down
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/2, changed state to down

Switch(config-if-range)#switchport mode trunk
Switch(config-if-range)#channel-group 1 mode on
Switch(config-if-range)#
Creating a port-channel interface Port-channel 1
Switch(config-if-range)#no shut
%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up
%LINK-5-CHANGED: Interface Port-channel 1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel 1, changed state to up
%LINK-5-CHANGED: Interface GigabitEthernet0/2, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/2, changed state to up
Switch(config-if-range)#
Switch(config-if-range)#exit
Switch#show etherchannel summary
Flags: D - down P - in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
u - unsuitable for bundling
w - waiting to be aggregated
d - default port

Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports

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1 Po1(SU) - Gig0/1(P) Gig0/2(P)

dsgm

If i remember correctly it should not be in trunk, or doesnt need to be, i may be wrong

Hondabuff

dsgm wrote: »

If i remember correctly it should not be in trunk, or doesnt need to be, i may be wrong

That's the whole point of Etherchannel is to make a aggregated trunk port of multiple links up to 8.
You might be thinking of a L3 Portchannel where you assign the portchannel an IP address.

dsgm

Hondabuff wrote: »

That's the whole point of Etherchannel is to make a aggregated trunk port of multiple links up to 8.
You might be thinking of a L3 Portchannel where you assign the portchannel an IP address.

you are correct sir

bravealikhan

Hi, thanks for your reply,

I tried the above commands but result was same.. on GigabitEthernet ports

But when i tried following commands on FastEthernet 23-24 to make an EtherChannel and its work fine,

SW-1:

# Interface range FastEthernet 0/23 - 24
# channel-protocol PaGP
# channel-group 1 mode desirable

SW-2:

# Interface range FastEthernet 0/23 - 24
# channel-protocol PaGP
# channel-group 1 mode desirable


Why i am not be able to bundled on GigabitEthernet Ports?

Hondabuff

What version of Packet tracer? I'm using 6.1.0.0120 and it works fine on the gig ports.