Funky behavior with 5224

This concerns a Dell 5224 switch with versions as follows:
Loader Version: 1.0.0.0
Boot ROM Version: 1.0.0.5
Operation Code Version (a fancy name for "firmware"): 3.1.0.8

Here is a description of the problem: Servers plugged into ports 1 through 12 can ping any other server on port 1 through 12, but CANNOT ping any server on port 13 or higher. Servers plugged into ports 13 or higher can ping any other server on port 13 or higher, but CANNOT ping any server on port 1 through 12.

Routing is handled by a fiber connected Cisco 3550 Layer 3 switch. I could ping the IP address of the Dell 5224 switch from some of the servers on the Dell 5224, but not from others. These ping packets would enter the Dell 5224, get tagged as VLAN 13, hopefully get shot out port 24 on their way to the Cisco 3550 switch for routing, then come back through port 24 on VLAN 99 to communicate with the estabished IP address of the Dell 5224 switch. In an ideal world, the Dell switch would respond on VLAN 99, send its reply packets out of port 24 to the Cisco for routing, then back up through port 24 on VLAN 13 and enter the server that sent the origional ping packet. This did not always happen; it sometimes depended on which side of the switch your servers were plugged into: sometimes ports 1-12 would respond and 13-23 wouldn't. Other times, 13-23 would respond but 1-12 wouldn't. And still other times, no ports could get a response.

The following is a dump of the running-config from the Dell 5224 switch. This ru has been edited here and there to protect our network, but is otherwise untouched.

!
hostname Dell5224
!
!
snmp-server community private rw
snmp-server community public ro
!
!
username admin access-level 15
username admin password 7 ha!wouldn'tyouliketoknow
username guest access-level 0
username guest password 7 ha!wouldn'tyouliketoknow
enable password level 15 7 ha!wouldn'tyouliketoknow
!
!
!NOTE: The VLAN names below have been changed to protect the guilty
!However, the lengths of the names below are as long as the longest
!VLAN name we've used in the production environment
vlan database
vlan 1 name VLAN-001_NAME----------1 media ethernet state active
vlan 2 name VLAN-002_NAME----------2 media ethernet state active
vlan 3 name VLAN-003_NAME----------3 media ethernet state active
vlan 4 name VLAN-004_NAME----------4 media ethernet state active
vlan 5 name VLAN-005_NAME----------5 media ethernet state active
vlan 6 name VLAN-006_NAME----------6 media ethernet state active
vlan 7 name VLAN-007_NAME----------7 media ethernet state active
vlan 8 name VLAN-008_NAME----------8 media ethernet state active
vlan 9 name VLAN-009_NAME----------9 media ethernet state active
vlan 10 name VLAN-010_NAME---------10 media ethernet state active
vlan 11 name VLAN-011_NAME---------11 media ethernet state active
vlan 12 name VLAN-012_NAME---------12 media ethernet state active
vlan 13 name VLAN-013_NAME---------13 media ethernet state active
vlan 14 name VLAN-014_NAME---------14 media ethernet state active
vlan 15 name VLAN-015_NAME---------15 media ethernet state active
vlan 51 name VLAN-051_NAME---------16 media ethernet state active
vlan 53 name VLAN-053_NAME---------17 media ethernet state active
vlan 99 name VLAN-099_NAME---------18 media ethernet state active
!
!
interface ethernet 1/1
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/2
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/3
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/4
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/5
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/6
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/7
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/8
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/9
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/10
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/11
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/12
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/13
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/14
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/15
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/16
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/17
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/18
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/19
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/20
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/21
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/22
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/23
switchport allowed vlan add 13 untagged
switchport native vlan 13
switchport allowed vlan remove 1
!
interface ethernet 1/24
no negotiation
switchport allowed vlan add 99 untagged
switchport native vlan 99
switchport allowed vlan remove 1
switchport acceptable-frame-types tagged
switchport mode trunk
switchport allowed vlan add 13,99 tagged
!
!
interface vlan 99
ip address 192.168.30.32
!
ip default-gateway 192.168.30.3
!
no spanning-tree
!
line console
!
line vty
!
end

My problem continues in the next post.