asked on

EtherChannel and VLAN Trunking in Catalyst 3750

Hi. I have the following configuration in my Cisco Catalyst 3750 switch. I would like to know what are they for:

vlan internal allocation policy ascending
!
!
interface Port-channel1
switchport access vlan 2
!
interface Port-channel2
switchport access vlan 2
!
interface Port-channel3
switchport access vlan 2
!
interface Port-channel4
switchport access vlan 2
!
****(output suppress)****
!
interface GigabitEthernet1/0/10
switchport access vlan 2
channel-group 1 mode on
!
interface GigabitEthernet1/0/11
switchport access vlan 2
channel-group 1 mode on
!
interface GigabitEthernet1/0/12
switchport access vlan 2
channel-group 2 mode on
!
interface GigabitEthernet1/0/13
switchport access vlan 2
channel-group 2 mode on
!
****(output suppress)****
!
interface GigabitEthernet1/0/49
switchport access vlan 3
switchport trunk encapsulation dot1q
switchport mode trunk
!
****(output suppress)****
!
interface GigabitEthernet2/0/10
switchport access vlan 2
channel-group 3 mode on
!
interface GigabitEthernet2/0/11
switchport access vlan 2
channel-group 3 mode on
!
interface GigabitEthernet2/0/12
switchport access vlan 2
channel-group 4 mode on
!
interface GigabitEthernet2/0/13
switchport access vlan 2
channel-group 4 mode on
!
****(output suppress)****
!
interface GigabitEthernet2/0/48
switchport access vlan 6
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 6,7
switchport mode trunk
!
!
!
Pls explain what the Port-channel and channel-group are for? and also the vlan 3 and vlan 6 in the trunk ports (GigabitEthernet1/0/49 and GigabitEthernet2/0/48). Thanks.

ASKER CERTIFIED SOLUTION

giltjr

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SOLUTION

calvinetter

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calvinetter

D'oh! giltjr beat me by 2 min! Should've hit refresh! ;)

giltjr

Well since we both said the same thing at least the asker know he has the correct answers.

What really weird is not only did we give the same answers (of course we did because they are right), but in the same way and almost the same words.

hoggiee

ASKER

interface GigabitEthernet2/0/48
switchport access vlan 6
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 6,7
switchport mode trunk

The switchport access vlan 6 shoud not appear in an interface configured as trunk port?

yasirirfan

Yes ur right remove the command

no switchport access vlan 6

cheers

Yasir

giltjr

--> switchport trunk allowed vlan 6,7

Just to make sure you know, this mean that even though this is a trunk only traffic to or from a host in VLAN 6 and 7 can go over this port.

yasirirfan

it allows traffic only from vlan 5 and 6

giltjr

What?

hoggiee

ASKER

giltjr and calvinetter:
Well...since you both have given the correct answer, at almost the same time, i think you two should have the same points.....fair enough ?! :)

giltjr

Fine with me. Thanks.

calvinetter

Thanks hoggiee!