network issues

razam

Hello guys,

I have a network setup and facing few problems in it. would appreciate if anyone can give some suggestion in improving it.

Devices
Core Switch = 4506-E
Access Switches = 2960

Connectivity
all access switches connected to core using single 1G fiber uplink.

Management
Vlan 100,
Core Switch = 192.168.100.1/24
Access Switches = 192.168.100.5/24 onwards

Data (internet)
vlans used 10 to 30
each vlan for 5 access switches
vlan 10 = 192.168.10.0/24 to vlan 30 = 192.168.30.0/24

DHCP Pools configured on Core Switch
default router for different vlans configured on the core switch (192.168.10.1, 192.168.11.1 .... 192.168.30.1)

default gateway configured on all access switches is 192.168.100.1 (management-ip address of core), should i keep this as a default gateway or should i change it to according to vlan (for example if access switch is in vlan 10, ip default gateway 192.168.10.1) ?

dhcp snooping is configured, spanning tree port fast configured, storm control configured


Problem
1) when connect computer to any access switch port, i face few packet drops after every 20 to 25 responses.
2) from the core side when i try to telnet any access switch, some switches take 3 to 4 tries to respond. if i ping them they will not respond, will use show mac address command, will not be able to see mac of the switch on management vlan. after 3 to 4 tries i will get ping response and will be able to telnet and will be able to see mac on that core switch port. what can be the reason for this issue ?

any suggestions for improving the network ? anything else i can implement on it ?

thank you

EdTheLad

Some configs would be nice, your management network is vlan 100 so the DG on the switches is correct 192.168.100.1.

mistabrumley89

What type of fiber cables are you using? SM or MM? Are your GBICS SM or MM? Not really enough to go on here, but just a couple basic things you can verify. Management VLAN should be fine to configure on your access switches. Can give us a copy of the log? Are ports flapping?

razam

fiber cable single mode, GBICs also single mode.. ports are not flapping

please follow this post, same case..

http://www.techexams.net/forums/ccnp/95845-packet-drops.html

tearofs

Use Wireshark or Tcpdump(Linux) to track what's going on behind the scenes.

thadizzy

What has this question got to do anything with the CCIE exam?

EdTheLad

I would actively encourage real network problems as opposed to how does this protocol work, after all that's why we are studying in the first place t be able to fix real networking issues. Also relevant for diagnostics section on new ccie v5.