Catalyst 6509 Vlan speed issue

[lukebrennan]

Hi Guys,

I'm new here, and have a question to get things rolling:

I recently setup a new user and managment vlan on my network which has been up until this point running all on vlan 1. The problem is I cannot download data at over 9mB/sec from an end device, uploading on this vlan is fine, up to 30mB/sec. At first I thought it was a limitation of a new 3750 I was using (maybe fiber issue), but after configuring a gigabit port directly on our 6509 core to this new vlan the same issue exists. I will note that devices on vlan 1 do not have this problem. I am kind of stumped here, the ports are connected at full duplex gig. The following is my vlan configuration on the 6509 core switch ( I have removed addressing from my paste, sorry) and a trunk port used for my access switch. Any help or direction is appreciated:

vlan 500

name Managment-Test

!

vlan 503

name User-Test

interface Vlan500

description Managment - Test

ip address *.*.*.78 255.255.255.240

no ip redirects

no ip proxy-arp

load-interval 30

!

interface Vlan503

description Access -Test

ip address *.*.*.254 255.255.255.0

ip helper-address *.*.*.*

no ip proxy-arp

load-interval 30

nterface GigabitEthernet7/22

no ip address

load-interval 30

udld port aggressive

switchport

switchport trunk encapsulation dot1q

switchport trunk native vlan 500

switchport trunk allowed vlan 1,500,503

switchport mode trunk

storm-control broadcast level 10.00

[Edison Ortiz]

STP will re-converge so it may be a small disruption in the traffic flow. It's safer to do it after-hours.

[lukebrennan]

Well, I made this change from home after hours last night. Came in this morning to test, same thing..

I thought for sure this problem was going to be solved after noticing my stp wasn't configured properly.

Whats next?

[lukebrennan]

Hi EdisonOrtiz,

Any direction on what to check next on this situation?

[Edison Ortiz]

Let's see the show spantree output once again.

[lukebrennan]

sh spanning-tree root

Root Hello Max Fwd

Vlan Root ID Cost Time Age Dly Root Port

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

VLAN0001 0 0015.c714.3401 0 2 20 15

VLAN0500 0 0015.c714.35f4 0 2 20 15

VLAN0503 0 0015.c714.35f7 0 2 20 15

sh spanning-tree summary

Switch is in pvst mode

Root bridge for: VLAN0001, VLAN0500, VLAN0503

EtherChannel misconfig guard is enabled

Extended system ID is disabled

Portfast Default is enabled

PortFast BPDU Guard Default is disabled

Portfast BPDU Filter Default is disabled

Loopguard Default is disabled

UplinkFast is disabled

BackboneFast is disabled

Pathcost method used is short

Name Blocking Listening Learning Forwarding STP Active

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

VLAN0001 1 0 0 181 182

VLAN0500 1 0 0 9 10

VLAN0503 1 0 0 9 10

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

3 vlans 3 0 0 199 202

[Edison Ortiz]

STP looks fine now, let's see a show ip route.

[lukebrennan]

Gateway of last resort is *.*.160.1 to network 0.0.0.0

*.*.0.0/21 is subnetted, 1 subnets

C *.*.160.0 is directly connected, Vlan1

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.217.159.64/28 is directly connected, Vlan500

C 10.217.128.0/24 is directly connected, Vlan503

S* 0.0.0.0/0 [1/0] via *.*.160.1

[Edison Ortiz]

Looks fine, running out of ideas. Can we see a sanitized show-tech from this switch ? You can also proceed and start a packet trace with an analyzer and see if you see anything out of the ordinary.

Run two traces, one while copying to/from the same VLAN and another while copying to/from the different VLANs.

[lukebrennan]

Here's the tech. I'll have to grab an analyzer somewhere, haven't used one in a few years.

Appreciate the help so far.

[Edison Ortiz]

Sorry, I see nothing wrong. What kind of application are you using to transfer the files ?

Would you mind using another protocol such as http or ftp and see if you can duplicate the speed issue ?

[lukebrennan]

I've been using http, ftp and rpc traffic, I just did an ftp test, here are the results:

vlan1 device -> vlan 503 device

Transferred 1 file totaling 2.60 GB in 4 minutes 43 seconds (9.41 MB/s)

vlan 503 device -> vlan 1 device

Transferred 1 file totaling 2.60 GB in 1 minute 45 seconds (25.72 MB/s)

[Edison Ortiz]

I don't know what else to suggest. I believe the only thing left to do, open a TAC case with Cisco.

[lukebrennan]

Yup, guess so, gotta bite the bullet.

I'll post what happens with them.

Thanks for going through everything else with me, learning experience.

[gearnsc]

Before you open the case ensure that cef is enabled, you may also want to try "ip cef distributed" from global config mode.

Verify cef with: "show ip cef"

Verify cef on an interface with: "show ip int vlan x | include cef"

[lukebrennan]

When I do an sh ip int vlan 503 | include cef

I get nothing.......