6248 switch intra vlan routing performance issue for some protocols.

Question

Experiencing a bizarre performance issue in our network that seems to only be affecting people in 2 different VLANs.  Our Oracle ERP system is web based, we also have a simple intranet home page on a different server. Both of those web servers reside in VLAN 1. HTTP traffic from PC's located in VLAN 110 and VLAN 180 to either of these destinations in VLAN1 is extremely slow as if the user is on a dial up connection. Web pages can take several minutes to load.  If I access the administrative share on the ERP server, or intranet web server from the users PC, I can transfer a file across the network to either server at about 95 MBs so that doesn't seem to be impaired in any way. What could possibly cause HTTP traffic from only certain VLAN to have such poor performance, while computers in other VLANs do not exhibit the performance issue at all ? and why are other protocols seemingly not affected ? If I reconfigure the switch port the client PC is connected to, to a different VLAN like 160 the HTTP performance issue goes away. The two servers in question are virtual machines, they are located on different hosts in the VMWare cluster so are using different Network cards and ports to connect to the network. Clients in other VLANs do not experience the performance issue when accessing those web pages. I've also noticed random periods of time where the performance issue goes away and things move normally.I'm in need of some suggestions of how to track down whatever is happening here. the switch stack has been restarted,The switch stack was flashed to the latest firmware this past weekend in an attempt to resolve the issue. ***************** Show Running Config ***********!Current Configuration:!System Description 'PowerConnect 6248, 3.3.18.1, VxWorks 6.5'!System Software Version 3.3.18.1!Cut-through mode is configured as disabled!configurevlan databasevlan 10,20,30,100,110,120,130,140,150,160,170-172,175,180,185,190,200vlan 220vlan routing 1 1vlan routing 110 2vlan routing 120 3vlan routing 100 4vlan routing 140 6vlan routing 130 7vlan routing 150 8vlan routing 200 9vlan routing 160 10vlan routing 30 11vlan routing 170 12vlan routing 171 13vlan routing 172 14vlan routing 175 15vlan routing 180 16vlan routing 185 17vlan routing 220 18vlan routing 190 19exitclock timezone -5 minutes 0 zone 'EST'stackmember 1 5member 2 5member 3 2member 4 2exitswitch 1 priority 1ip address noneip address vlan 10logging facility local5ip routingip route 0.0.0.0 0.0.0.0 10.100.100.3 ip helper-address 10.100.100.203 domainip helper-address 10.100.100.203 dhcpip helper-address 10.100.100.254 dhcpip helper-address 10.100.100.203 ntpinterface vlan 1routingip address 10.100.100.239 255.255.255.0exitinterface vlan 20name 'guestwifi'exitinterface vlan 30name 'varmour-vlan30'routingip address 10.100.30.1 255.255.255.0exitinterface vlan 100routingexitinterface vlan 110name 'desgn_engr'routingip address 10.100.110.1 255.255.255.0exitinterface vlan 120name 'press room - Hudson bldg'routingip address 10.100.120.1 255.255.255.0exitinterface vlan 130name '3rd_floor'routingip address 10.100.130.1 255.255.255.0exitinterface vlan 140name 'Bobst Area'routingip address 10.100.140.1 255.255.255.0exitinterface vlan 150name 'Shipping - Warehouse'routingip address 10.100.150.1 255.255.255.0exitinterface vlan 160name 'Fifth_Floor_PC'routingip address 10.100.160.1 255.255.255.0exitinterface vlan 170name 'Packetfence'routingexitinterface vlan 171name 'Registration'routingexitinterface vlan 172name 'Isolation'routingexitinterface vlan 175name 'Wifi'routingip address 10.100.75.1 255.255.255.0exitinterface vlan 180name 'Wired_LAN'routingip address 10.100.80.1 255.255.255.0exitinterface vlan 185name 'Printers'routingip address 10.100.85.1 255.255.255.0exitinterface vlan 190routingip address 10.100.190.1 255.255.255.0exitinterface vlan 200name 'voip'routingip address 10.100.200.1 255.255.255.0exitinterface vlan 220name 'Guest_Wifi'routingip address 10.100.22.1 255.255.255.0exitusername ' ' password level 15 encrypted dot1x system-auth-control aaa authentication dot1x default radius aaa authorization network default radius voice vlan radius-server key ' ' radius-server host auth 10.100.X.X name 'Packetfence' usage 802.1x exit monitor session 1 modeline sshexec-timeout 1200exitspanning-tree priority 4096!interface ethernet 1/g1description 'Watchguard Firewall Connection'spanning-tree portfastdot1x port-control force-authorizedexit!interface ethernet 1/g2spanning-tree portfastswitchport mode generalswitchport general pvid 171switchport general allowed vlan add 171-172,180,185switchport general allowed vlan add 200 taggeddot1x port-control mac-baseddot1x re-authenticationdot1x unauth-vlan 171dot1x mac-auth-bypassexit!interface ethernet 1/g3spanning-tree portfastswitchport mode generalswitchport general pvid 171switchport general allowed vlan add 171-172,180,185switchport general allowed vlan add 200 taggeddot1x port-control mac-baseddot1x re-authenticationdot1x unauth-vlan 171dot1x mac-auth-bypassexit!interface ethernet 1/g4spanning-tree portfastswitchport mode generalswitchport general pvid 171switchport general allowed vlan add 171-172,180,185switchport general allowed vlan add 200 taggeddot1x port-control mac-baseddot1x re-authenticationdot1x unauth-vlan 171dot1x mac-auth-bypassexit!interface ethernet 1/g5description 'Joels Office'spanning-tree portfastdot1x port-control force-authorizedexit!interface ethernet 1/g6description 'Cisco VoIP ATA'spanning-tree portfastdot1x port-control force-authorizedexit!interface ethernet 1/g7spanning-tree portfastswitchport mode generalswitchport general pvid 171switchport general allowed vlan add 171-172,180,185switchport general allowed vlan add 200 taggeddot1x port-control mac-baseddot1x re-authenticationdot1x unauth-vlan 171dot1x mac-auth-bypassexit!interface ethernet 1/g8spanning-tree portfastswitchport mode generalswitchport general pvid 171switchport general allowed vlan add 171-172,180,185switchport general allowed vlan add 200 taggeddot1x port-control mac-baseddot1x re-authenticationdot1x unauth-vlan 171dot1x mac-auth-bypassexit!interface ethernet 1/g9description 'Mail Room plus Wifi'spanning-tree portfastswitchport mode generalswitchport general pvid 160switchport general allowed vlan add 160switchport general allowed vlan add 200 taggeddot1x port-control force-authorizedexit!interface ethernet 1/g10spanning-tree portfastswitchport mode generalswitchport general pvid 171switchport general allowed vlan add 171-172,180,185switchport general allowed vlan add 200 taggeddot1x port-control mac-baseddot1x re-authenticationdot1x unauth-vlan 171dot1x mac-auth-bypassexit!interface ethernet 1/g11description 'Rons Office'spanning-tree portfastswitchport mode generalswitchport general pvid 160switchport general allowed vlan add 160switchport general allowed vlan add 200 taggeddot1x port-control force-authorizedexit!interface ethernet 1/g12spanning-tree portfastswitchport mode generalswitchport general pvid 171switchport general allowed vlan add 171-172,180,185switchport general allowed vlan add 200 taggeddot1x port-control mac-baseddot1x re-authenticationdot1x unauth-vlan 171dot1x mac-auth-bypassexit!interface ethernet 1/g13spanning-tree portfastswitchport mode generalswitchport general pvid 171switchport general allowed vlan add 171-172,180,185switchport general allowed vlan add 200 taggeddot1x port-control mac-baseddot1x re-authenticationdot1x unauth-vlan 171dot1x mac-auth-bypassexit!interface ethernet 1/g14spanning-tree portfastswitchport mode generalswitchport general pvid 160switchport general allowed vlan add 160switchport general allowed vlan add 200 taggeddot1x port-control force-authorizedexit!interface ethernet 1/g15spanning-tree portfastswitchport mode generalswitchport general pvid 171switchport general allowed vlan add 171-172,180,185switchport general allowed vlan add 200 taggeddot1x port-control mac-baseddot1x re-authenticationdot1x unauth-vlan 171dot1x mac-auth-bypassexit. . interface ethernet 4/g47dot1x port-control force-authorizedexit!interface ethernet 4/g48dot1x port-control force-authorizedexit!interface loopback 1exitsnmp-server community rw snmp-server community ro exit ****** show version / Sysinfo ******* System Description............................. PowerConnect 6248, 3.3.18.1 VxWorks 6.5 Machine Type................................... PowerConnect 6248 Machine Model.................................. PCT6248 Part Number.................................... BCM56314 Software Version............................... 3.3.18.1 System Up Time................................. 1 days, 21h:04m:00s 10/100 Ethernet/802.3 interface(s)............. 40 Gig Ethernet/802.3 interface(s)................ 51 10Gig Ethernet/802.3 interface(s).............. 0 Virtual Ethernet/802.3 interface(s)............ 19 Management Standby Preconfig Plugged-in Switch CodeSwitch Switch Status Model ID Model ID Status Version------ ------------ ------------- ------------- --------------------- --------1 Mgmt Switch PCT6248P PCT6248P OK 3.3.18.12 Stack Member PCT6248P PCT6248P OK 3.3.18.13 Stack Member PCT6248 PCT6248 OK 3.3.18.14 Stack Member PCT6248 PCT6248 OK 3.3.18.1

DELL-Josh Cr · Answer

Hi,

Is everything going through the one switch or are their other devices in between? You may want to mirror one of those ports and use wireshark to see if there are dropped packets or something else going on. It looks like you are up to date on firmware and have moved the management vlan from vlan 1, which are common reasons for performance issues.

Networking General

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