I think you may be referring to secondary networks for an Interface
and then Sub-interfaces.
Secondary refers to secondary network or IP for an interface. Say you
want to assign more than (1) IP or block of IP's to an interface what
already has an IP address/block assigned.. say.:
interface Ethernet 0
ip address 10.0.0.1 255.255.255.0
To add another IP or block to the interface you would do the
following:
ip adress {network} {netmask} secondary
making..
interface Ethernet 0
ip address 10.0.0.1 255.255.255.0
ip address 192.168.0.1 255.255.255.0 secondary
Now you'll have 2 networks directly connected to Ethernet0 in your
route table.
Sub-Interfaces -
I've only used sub-interfaces in a frame-relay scenario. Say you
have multiple branch offices which are all connected via Frame Relay.
In order to communicate with them you need FR PVC's mapped to all of
them throughout the frame cloud, not necessarily full mesh.. :). Each
PVC will have a separate DLCI pair describing essentially
entrance/exit points in the network. You will need to build
frame-relay subinterfaces with a dlci to distinquish each branch
office connection for the other.
Say.
interface Serial0.1 is used to connect to BranchA
interface Serial0.2 is used to connect to BranchB
interface Serial0.3 is used to connect to BranchC
In turn.. BranchA will need an sub interface with DLCI configured to
speak with Branch B and so on..
Hope that make sense.. If not I'm sure someone on here can straighten
me and you out..
Cheers.
Mas
On 25 Jan 2001 15:11:40 -0500, [EMAIL PROTECTED] (Charles Nunie) wrote:
Hi everyone,
What's the difference between secondary and sub interfaces and when and where
are they applied.
Dzilo
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