Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

cisco 3750 and LACP

Hi All

I have configured ports 1 -5 on a single 3750G 24TS

switch for dynamic link aggregation using LACP. To these ports are connected a single apple xserve with 5 bonded ethernet interfaces, the bonded int is manually assigned a single ip address.

I can ping any node connected to the 3750 switch from the Xserve, and vice versa.

However, i have connected the 3750 to a 3500XL stack consisting of 4 3524XL switches via gigabit port 23 on the 3750 to a 100mbps port on a 3524XL stack member. And i'm finding that i can't ping any device on the remote stack from the xserve. But i can ping devices conencted to the stack from all other nodes on the 3750 switch. So it doesn't appear to be a problem with the uplink for non linkaggregated nodes.

In addition i cannot ping the xserve from the IOS command line on the 3750 eventhough i can ping all other nodes both on local and remote segments/switches. Here's my running config plus info on the port-channel i have configured (I've also noticed that port-channel 1 is

using the mac address of the switch itself - is this normal ?)

version 12.2

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname Switch

!

!

switch 1 provision ws-c3750g-24ts

ip subnet-zero

!

!

spanning-tree mode pvst

no spanning-tree optimize bpdu transmission

spanning-tree extend system-id

!

!

!

!

interface Port-channel1

!

interface GigabitEthernet1/0/1

channel-group 1 mode active

!

interface GigabitEthernet1/0/2

channel-group 1 mode active

!

interface GigabitEthernet1/0/3

channel-group 1 mode active

!

interface GigabitEthernet1/0/4

channel-group 1 mode active

!

interface GigabitEthernet1/0/5

channel-group 1 mode active

!

interface GigabitEthernet1/0/6

!

interface GigabitEthernet1/0/7

!

interface GigabitEthernet1/0/8

!

interface GigabitEthernet1/0/9

!

interface GigabitEthernet1/0/10

!

interface GigabitEthernet1/0/11

!

interface GigabitEthernet1/0/12

!

interface GigabitEthernet1/0/13

!

interface GigabitEthernet1/0/14

!

interface GigabitEthernet1/0/15

!

interface GigabitEthernet1/0/16

!

interface GigabitEthernet1/0/17

!

interface GigabitEthernet1/0/18

!

interface GigabitEthernet1/0/19

!

interface GigabitEthernet1/0/20

!

interface GigabitEthernet1/0/21

!

interface GigabitEthernet1/0/22

!

interface GigabitEthernet1/0/23

!

interface GigabitEthernet1/0/24

!

interface GigabitEthernet1/0/25

!

interface GigabitEthernet1/0/26

!

interface GigabitEthernet1/0/27

!

interface GigabitEthernet1/0/28

!

interface Vlan1

ip address 10.x.x.x 255.255.252.0

!

ip classless

ip http server

!

!

control-plane

!

!

line con 0

line vty 5 15

!

end

Switch#

help much appreciated

Was

2 REPLIES
New Member

Re: cisco 3750 and LACP

Just to follow up, the commands is have used to create the etherchannel were;

channel-protocol lacp

channel-group 1 mode active

Purple

Re: cisco 3750 and LACP

According to your description this appears to be a single flat network in vlan 1 . The only thing I can think of is to make sure all your addressing is correct and everyone is in the same address range governed by the 255.255.252.0 mask .

832
Views
0
Helpful
2
Replies