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Cisco 6500 and etherchannel to a server

Hi all. I have been trying to establish a etherchannel between a Cisco 6500 switch and a Solaris 10 server over it's 2 gigabit ports but without much luck.

The thing is that when I configure everything I can see the etherchannel go up but the problem is that I can ping the server from server VLAN and the server can ping only inside server VLAN and not outside it. If I try to ping from outside the VLAN and vice versa I get time outs. I can still ping all the other servers in the server VLAN from other VLAN's.

I'm attaching the relevant parts of the config so maybe someone can see something that I'm missing.

Thanks in advance for all the help.

1 ACCEPTED SOLUTION

Accepted Solutions

Re: Cisco 6500 and etherchannel to a server

Hi,

The EtherChannel is working fine, i believe that the problem is most probably the absence of a default gateway on the server.

P.S. The "switchport trunk encapsulation dot1q" is irrelevant under the port-channel, you don't need it in your setup.

BR,

Mohammed Mahmoud.

3 REPLIES

Re: Cisco 6500 and etherchannel to a server

Hi,

The EtherChannel is working fine, i believe that the problem is most probably the absence of a default gateway on the server.

P.S. The "switchport trunk encapsulation dot1q" is irrelevant under the port-channel, you don't need it in your setup.

BR,

Mohammed Mahmoud.

New Member

Re: Cisco 6500 and etherchannel to a server

The "switchport trunk encapsulation dot1q" is something that was included when the etherchannel went up. Every time I try to remove it the switch won't let me and shows this message:

"Command rejected! GigabitEthernet8/3 in port-channel only support Dot1q Trunk Encapsulation "

As for the default gateway the server administrator assures me that the default gateway is correct. Here is the routing table from the server:

Routing Table: IPv4

Destination Gateway Flags Ref Use Interface

-------------------- -------------------- ----- ----- ---------- ---------

default 10.64.12.1 UG 1 0

10.0.0.0 10.4.0.51 U 1 4766 ge0

10.64.12.0 10.64.12.101 U 1 2 ce0

10.64.12.0 10.64.12.105 U 1 0 ce0:1

10.64.12.0 10.64.12.106 U 1 0 ce0:2

10.64.12.0 10.64.12.107 U 1 0 ce0:3

10.64.12.0 10.64.12.108 U 1 0 ce0:4

10.64.12.0 10.64.12.109 U 1 0 ce0:5

224.0.0.0 10.64.12.101 U 1 0 ce0

127.0.0.1 127.0.0.1 UH 8 987 lo0

The first entry shows the default route and it displays the correct gateway ie 10.64.12.1 and that it's up.

New Member

Re: Cisco 6500 and etherchannel to a server

We found the problem in the configuration of the server. It seems that the Solaris server by default assigns subnet masks to the interface according to the class.

In our case our server had the IP address 10.64.12.101 and the server automatically assigned 255.0.0.0 mask. If that isn't enough it also added a route to 10.0.0.0 network(where all our other VLANs are) to the routing table but set the gateway to 10.4.0.51(the 2nd route from the previous post). On top of all that when you reboot the server it doesn't remember the subnet mask you entered on the interface but reverts to the default setting I explained and you have to write the IP manually all over again. Thanks for all your help.

BTW is there some way to test load balancing across the etherchannel?

And what about the encapsulation line of the etherchannel? Any idea about that?

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