Problem of the network connectivity to the HP DL380 G6

[roy.tam123]

Dear All,

Recently, my server team told me that they got a network connectivity problem when the server HP DL380 G6 was rebooting. They said the NIC was resumed after 30 seconds everytime they reboot the server or reset the NIC. And we made a test to reset the NIC. It takes around 30 seconds to resume. I checked that the portfast has been applied to the C6509 switchport. During the test, I checked the port was resumed immediately, the spanning-tree is in "forward" state, but the MAC address wasn't learnt until 30 seconds later. The ping was responsed once the MAC address was learnt.

I tried to search the internet and other document, but no luck to find any solution... So I would post thie topic to CSC and hope can have a advise. Thanks.

Best Regards,

Roy

[Peter Paluch]

Hello Roy,

Can you please post the following outputs?

• Complete configuration of the switchport to which the server is connected (let's call this interface XXX)
• Output of the show interface XXX switchport
• Output of the show spanning-tree interface XXX
• Output of the show spanning-tree interface XXX portfast

Thank you!

Best regards,

Peter

[roy.tam123]

switch#sh run int gi4/15
Building configuration...

Current configuration : 868 bytes
!
interface GigabitEthernet4/15

switchport
switchport access vlan 190
switchport mode access
no ip address
speed 1000
duplex full
wrr-queue random-detect min-threshold 1 80 100 100 100 100 100 100 100
wrr-queue random-detect min-threshold 2 80 100 100 100 100 100 100 100
wrr-queue random-detect min-threshold 3 50 60 70 80 90 100 100 100
wrr-queue random-detect max-threshold 1 100 100 100 100 100 100 100 100
wrr-queue random-detect max-threshold 2 100 100 100 100 100 100 100 100
wrr-queue random-detect max-threshold 3 60 70 80 90 100 100 100 100
wrr-queue cos-map 1 1 1
wrr-queue cos-map 2 1 0
wrr-queue cos-map 3 1 4
wrr-queue cos-map 3 2 2
wrr-queue cos-map 3 3 3
wrr-queue cos-map 3 4 6
wrr-queue cos-map 3 5 7
no snmp trap link-status
spanning-tree portfast
service-policy input MARKING
end

switch#sh int gi4/15 switch
Name: Gi4/15
Switchport: Enabled
Administrative Mode: static access
Operational Mode: static access
Administrative Trunking Encapsulation: negotiate
Operational Trunking Encapsulation: native
Negotiation of Trunking: Off
Access Mode VLAN: 190 (XXXXX-XX-SERVAC-VL190/23)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Unknown unicast blocked: disabled
Unknown multicast blocked: disabled

switch#sh spanning-tree int gi4/15

Vlan             Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
VLAN0190         Desg FWD 4         128.399  Edge P2p

switch#sh spanning-tree int gi4/15 portfast
VLAN0190         enabled

[Peter Paluch]

Hello Roy,

Thank you for the additional information.

There is nothing wrong with your current configuration. Every parameter I was interested in seems to check out OK. I assume you cannot do free experiments with the server right now as it is in a production network.

So what I suggest is making a couple of experiments on an unused port, preferably on the same line card. Replicate the settings of the Gi4/15 on the new port and connect a test PC or a laptop to it. Then try to perform the connectivity tests like you did with the server - preferably, ping the test laptop from outside. Also, use Wireshark on the test laptop to see if ARP requests, ICMP pings etc. are arriving properly as soon as the device is plugged in.

A couple of questions, though:

• What kind of STP are you running in your network?
• Are you running VTP Pruning in your VTP domain?
• When the connectivity tests towards the server were performed, was the station sending the pings attached to the same 6509 switch as the server? If not, is it possible to repeat this test and have the test station connected to the same switch, or have the switch itself ping the server if it has a SVI in VLAN190?

Thank you!

Best regards,

Peter

[roy.tam123]

Hi Peter,

Many thanks for your advise. I will try to perfrom the test.

1. The switch is in rapid-pvst mode.

2. The VTP Pruning mode is disabled in the VTP domain.

Best Regards,

Roy