[c-nsp] 2821 and my HWIC-1FE again - FYI

[Bernd Ueberbacher]

Hi there!

The problem I posted some time ago was driving me crazy and the hint I 
got in a private message also didn't solve it (thanks for mail though!), 
so I tried to locate the source of the problem...

After a mental breakdown I tried a dot1q capable switch from a different 
vendor and the packetloss decreased a bit (although not completely, but 
it wasn't the most expensive switch either)...
I didn't want to believe that a Cisco router isn't 100% compatible to a 
Cisco Catalyst so I replaced everything back to the original 
configuration (3640 with 2924). Everything worked like a charm. I 
replaced the 2924 with a 2950 and still everything worked like a charm. 
That proofed to me that the 2950/config isn't the problem.
I thought that the HWIC-1FE can't be the problem either, because my 
laptop directly connected to the HWIC-1FE (subinterface) worked just 
fine. It seemed that the HWIC-1FE just doesn't want neither my 2950 nor 
my 2924.

I saved the config, delete all the subinterfaces on the HWIC-1FE and 
configured the second onboard gigabit interface with those 
subinterfaces. The config hasn't been changed, I just replaced all the 
fastethernet0/0/0.xxx with gigabitethernet0/1.xxx and pasted it, plugged 
in the 2950 and guess what... since that moment everything works! The 
onboard Gi0/1 likes my 2950 and there is no packetloss at all anymore! I 
gave the HWIC-1FE a last chance before throwing it out of the window and 
connected the backup link to it. No packetloss, good performance, ... 
everything fine!!!

After trying so much I'm pretty sure that in 12.4.15-T1 there IS a 
problem if you just plug in a 2950 and build a trunk. Has anybody had 
the same problem or are there some special settings I have to configure 
to solve this? Could the problem be that the switches don't like the new 
HWIC-1FE (but a 2950 isn't that old and likes the Gi0/1 just fine...)
By default it just doesn't work here...



Thanks,
Bernd




Bernd Ueberbacher wrote:
> Hi there!
>
> I posted a question about the HWIC-1FE some time ago and also wrote that 
> everything is working fine, but I wrote that so soon :-(
>
> Right now I got a running config with a 3640 and a 2924XL-EN behind 
> (don't laugh, they are old but they work! ;-)
> One port of the 3640 is the uplink and the second port is connected to 
> the trunk of the switch. Five subinterfaces for five VLANs with /30 subnets.
> Here everything works perfect!
>
> The CPU load of the 3640 is about 40% and there should be some policing 
> etc, so I wanted to "upgrade" to a 2821 and a 2950 behind.
> Gi0/0 is an uplink and Gi1/0 is a backup uplink. The HWIC-1FE connects 
> to the trunk of the 2950. Same VLANs, same config.
> If I ping the uplink ports everything is perfect. If I ping the HWIC (no 
> matter if it's the fastethernet0/0/0 or one of the subifs 
> fastethernet0/0/0.123) everything works fine, too. If I'm going to ping 
> one of the computers on one of the VLANs (in the /30 subnet, all 100mbit 
> full, locally connected), I ALWAYS get a 2-3% packet loss...
> If I change the 2950 to the 2924 (old config or new manual config) I 
> have the same problem. Ports (switch an router) are fixed to 100 full. 
> If I configure the interface on my FreeBSD Laptop as VLAN ID 123, plug 
> it into the HWIC-1FE and ping the subinterface on the router, everything 
> is PERFECT.
> If I plug everything back as desired and ping from one VLAN to an other 
> VLAN (over the router), I get about 4-6% packet loss. Still no 
> difference if I use the 2924 or 2950. I changed the cable, configured 
> everything from scratch, went to church, ... nothing helps :-((((((((((( 
> Logging etc shows nothing and no errors on the interfaces!
>
>
> Can anybody explain this phenomenon?
>
>
>
> Thanks,
> Bernd
>
> PS:
> Router:
> interface FastEthernet0/0/0
>  no ip address
>  duplex full
>  speed 100
> !
> interface FastEthernet0/0/0.301
>  encapsulation dot1Q 301
>  ip address 10.50.50.2 255.255.255.252
>  no cdp enable
> !
> .......
>
>
> Switch:
> interface FastEthernet0/1
>  duplex full
>  speed 100
>  switchport access vlan 301
>  spanning-tree portfast
> .......
> interface FastEthernet0/24
>  description TRUNK to c2821
>  duplex full
>  speed 100
>  switchport trunk encapsulation dot1q
>  switchport trunk allowed vlan 1,300-399,1002-1005
>  switchport mode trunk
>
>
>
>
>
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