Regarding Cisco Catalyst 2960 switch configuration

[hcspl]

Dear Team,

            Recently we have installed three nos of Cisco Catalyst 2960 switches at our customer premises.i am facing some issue while configuring the switch,

1) I have to configure three  vlan in each Switch  viz. VLAN6 with ip add 192.168.5.6, 192.168.5.7, 192.168.5.8 with the subnet mask 255.255.254.0

  i have configured respective  vlan on each switch also configured the Trunk port on each  switch.also applied the broadcast limit up 20mb on each port of switch

uplink to my catalyst 2960switch is approx 90 mtr ,which will connect to layer three switch on other end,i have also configured the trunk on layer three port.

now when i connect the uplink,it works smoothly for some time, i mean i get the ping reply withing 1 ms of my firewall or any server within LAN , but after some time the latency get increased up to 1000 ms locally.and after several time of interval it get decreased.

also it affect on existing network,when i unplugged the uplink my existing network work smoothly without any interruption.  

So what can i do to resolve this issue.

Please help me to sort out  this issue.

Awaiting for favorable and prompt reply from you Guys...... 

[Nagendra Kumar Nainar]

When you see 1000 msec latency, do you see any spanning loop or high CPU on these switches?. What is the response time if you ping from those server to the switch IP addresses (192.168.5.x)?.

Does the issue goes away by itself or do you always have to bring down the uplink to fix this issue?.

-Nagendra

[hcspl]

Hi,

I checked the cpu utilisation of my all three switches and its seems normal.

Now if i removed the uplink ,the existing network work smoothly.but when i connect the uplink latency will get increased after several interval of time.

 I checked from server end also,getting high latency.

So could you please provide me the configuration changes which is to be configure on switch.

If possible can u pls take the remote session .

Awaiting for your favorable reply...

[hcspl]

Dear Nagendra,

please check the below configuration of my switch,from other end I have connected the uplink to Nortel switch.

!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
!
!
!
!
!
interface FastEthernet0/1
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/2
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/3
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/4
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/5
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/6
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/7
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/8
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/9
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/10
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/11
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/12
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/13
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/14
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/15
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/16
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/17
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/18
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/19
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/20
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/21
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/22
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/23
 switchport access vlan 4
 switchport mode access
!
interface FastEthernet0/24
 switchport access vlan 4
 switchport mode access
!
interface GigabitEthernet0/1
 description "Uplink connected to Nortel Switch "
 switchport trunk native vlan 4
 switchport mode trunk
 switchport nonegotiate spanning-Tree mst
!
interface GigabitEthernet0/2
 description " Link connected to CAP3 switch Port Gi0/1 "
 switchport trunk native vlan 4
 switchport mode trunk
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan4
 ip address 192.168.5.7 255.255.254.0
!
ip default-gateway 192.168.4.2
ip http server
ip http secure-server
!

end

Please advice me to resolve the issue.