troubleshooting Question

Having trouble adding a new VLAN and its netwotrk address to our LAN

Avatar of marceloNYC
marceloNYCFlag for United States of America asked on
RoutersSwitches / HubsNetwork Operations
34 Comments2 Solutions1067 ViewsLast Modified:
Dear Experts:

I need some help understanding why I can't add the new LAN IP address for VLAN 777 (example ID). It is working on the router fine I can ping the gateway address for it in the router for example 172.16.9.1 is replying fine from the my internal network address 172.16.8.88.

The devices that are in VLAN 777 using IPs of 172.16.9.100-150 are not replying.

VLAN 777 is not able to IP route at all.

The Cisco switch is a Catalyst 3560. The current configuration for it as follows:

interface FastEthernet0/1
 switchport access vlan 777
 spanning-tree portfast
 spanning-tree guard root

interface GigabitEthernet0/1
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 999
 switchport trunk allowed vlan 1,all our VLANS listed....
 switchport mode trunk

interface Vlan777
 description video
 no ip address
 no ip route-cache
 no ip mroute-cache

interface Vlan777
 description video
   
ip default-gateway 172.16.10.1  <-- all switches have this gateway is for the management network

Here is a ping from the actual switch to the Router:

sw#ping 172.16.9.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.9.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/4/9 ms

Other LAN addresses:

sw#ping 172.16.8.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.8.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/8 ms

We need to ping this devices:

sw#ping 172.16.9.100

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.9.100, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)


For your help I thank you!
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