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Re: Few questions about cisco switch

My Cisco Switch has below configuration:

spanning-tree mode pvst

no spanning-tree optimize bpdu transmission

spanning-tree extend system-id

no spanning-tree vlan 1


vlan internal allocation policy ascending


interface FastEthernet0

no ip address

--More--                            shutdown


interface GigabitEthernet1/0/1

switchport access vlan 101

no cdp enable


interface GigabitEthernet1/0/7

switchport access vlan 102

no cdp enable


interface GigabitEthernet1/0/13

switchport access vlan 103

no cdp enable


interface GigabitEthernet1/0/19

switchport access vlan 104

no cdp enable


interface GigabitEthernet1/0/24

switchport mode trunk

no cdp enable


interface Vlan1

ip address

no ip proxy-arp

no ip route-cache


ip default-gateway

no ip http server

no ip http secure-server


access-list 10 permit

no cdp run

         snmp-server community cisco RO 10

snmp-server enable traps snmp authentication linkdown linkup coldstart warmstart

snmp-server enable traps vlan-membership

snmp-server host cisco snmp is Firewall interface is a workstation connected to Firewall

Each VLAN is connected to a Load balancer which default gateway is set to Firewall interface (

The question is :

1. The workstation cannot get SNMP data from the switch. WHY?

2. VLAN 102 has an NTP Server But I cannot get NTP Update from Switch. WHY?

Confirmed that Firewall policy is permitted traffic

ANYONE knows what happened?


  • LAN Switching and Routing
Everyone's tags (2)
Hall of Fame Super Silver

Re: Few questions about cisco switch

I do not see anything in the config that you posted about NTP so it makes it difficult to know why it is not working.

What I see in the config does not explain why the workstation can not get SNMP data. So I wonder if it is something outside of the switch. You tell us that the firewall policy should permit it but I wonder if there is some aspect of the firewall that is causing the problem. Perhaps there is a problem with the trunk connection between the switch and the firewall? Perhaps some vlan is not correctly carried over that trunk? Perhaps there is not a correct route on the firewall?



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