12-16-2008 01:21 AM - edited 03-04-2019 12:43 AM
hi, currently i am using cisco cat4000-I9S-M), Version 12.2(25)EWA8, my question is that i want to configure sub interfaces on it. when i issue the command int gig1/1.100 it didn't recongnize that commmand.How can i configure sub interfaces on 4948 switch.
Thanks
12-16-2008 01:53 AM
I dont think sub interfaces are supported on the 4948 platform
Narayan
12-16-2008 01:57 AM
Hi,
In order to configure a subinterface the port must be Layer3 (routed port). Try with the command:
interface gig1/1
no switchport
And then create the subinterface with the command
interface gig1/1.100
I hope this helps.
Best regards.
Massimiliano.
12-16-2008 02:50 AM
hi,
i have configured the port layer 3 and then issue the command interface gig1/1.100 it doesnot recongnize the sub interface command. it gives " % Invalid input detected at '^' marker." message.
12-16-2008 06:23 AM
Unsure, but is there some VLAN trunking command required at the Ethernet parent interface before Ethernet subinterfaces can be defined?
12-16-2008 06:32 AM
hi,
any idea how to configure sub interfaces on 4948 switch
12-16-2008 06:50 AM
As I wrote, I'm unsure. Hoping someone else might comment if my vague recollection about the parent interface was correct. Don't have a Cisco box to test on.
12-16-2008 08:34 AM
You don't need to do anything special once configured as a routed port.
If you type in
int gi1/1.100 and it gives an invalid input error then i think Narayan is right in that the 4948 doesn't support subinterfaces.
Can i ask why you need subinterfaces when you can use L3 SVI's on the 4948 ?
Jon
12-17-2008 12:00 AM
hi,
Actually i am getting internet bandwidth and i have eight sites connected to my router. My service provider provides my cable in which they pass all the vlans for this i have to configured dot1q and subinterfaces.
12-17-2008 12:21 AM
"i have eight sites connected to my router. My service provider provides my cable in which they pass all the vlans"
connection from ur service provider is terminated on router or 4948 switch?
12-17-2008 02:55 AM
hi,
connection from my service provider is terminated on my 4948 switch. I have router but don't have spare FastEthernet port.
Thanks
12-17-2008 04:51 AM
If the service provider is sending all the vlans down the link then it must be a trunk link. So you could use subinterfaces but then again you could use SVI's. So lets say you have 3 vlans
vlan 10 = 192.168.5.0/24
vlan 11 = 192.168.6.0/24
vlan 12 = 192.168.7.0/24
make the interface that the cable connects into a trunk
int gi0/24
switchport trunk encapsulation dot1q
switchport mode trunk
then
int vlan 10
ip address 192.168.5.1 255.255.255.0
no shut
int vlan 11
ip address 192.168.6.1 255.255.255.0
no shut
int vlan 12
ip address 192.168.7.1 255.255.255.0
no shut
Jon
12-18-2008 12:04 AM
hi,
my service provider is providing me ip with /30 mask. what ip should i give to svi interface and what ip in that vlan.
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