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Home > Archive > alt.certification.cisco > September 2003 > Stuck on Subinterfaces - HELP!
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Stuck on Subinterfaces - HELP!
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| I am currently studying for the BSCI Routing Exam using the Sybex Books on a
home Lab of 4 2500's and 1 2600. It has been working great and I have always
been very pleased with the Sybex Series. Unfortunately they have never covered
Subinterfaces well enough and many of the Labs In the CCNP BSCI book are using
them. I'm just trying to set up various network arrangements to route IP
across Serial Subinterfaces on a "Plain old Ethernet LAN".....Not using a Frame
Relay, IPX, or ISL for VLAN's on Ethernet ports. There seems to be enough
information in the books to configure Subinterfaces and set Frame Encapsulation
Types for those purposes, but not for basic IP routing. My problems start when
I set up Subinterfaces on the Serial Ports with IP Addresses, set the clocking,
and then bring up the interfaces. When I look at them on each router, they all
show as Up and Line Protocol up - But I just can't seem to Ping any of the IP's
on the Serial ports if they, or the other end they are attached to, are
Subinterfaces. If I can't Ping I sure can't route right? When I stick to
regular physical interfaces, everything works great. Am I missing something
important? If any of you Cisco Experts out there could offer any suggestions,
I would hugely appreciate it. I'm kind of stuck on Stall right now and can't
move on to any of the other Labs until I resolve this. Thanks.
Rich.
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| Robert Chen 2003-09-04, 11:25 am |
| Clock should be set on the main physical interfaces. The sub-interfaces
will use the clocking that is provided by the main physical interface. You
are correct if you can't ping, you can't route. The Encapsulations and
frame are set on the main interface. What goes on the sub-interface is the
IP address of the sub-interface and the DLCI number or VPI/VCI number (if
you are dealing with ATM). Give that a try. It should work.
"Rich" <me@nowhere.com> wrote in message
news:taG5b.105147$xf.16843@lakeread04...
> I am currently studying for the BSCI Routing Exam using the Sybex Books on
a
> home Lab of 4 2500's and 1 2600. It has been working great and I have
always
> been very pleased with the Sybex Series. Unfortunately they have never
covered
> Subinterfaces well enough and many of the Labs In the CCNP BSCI book are
using
> them. I'm just trying to set up various network arrangements to route IP
> across Serial Subinterfaces on a "Plain old Ethernet LAN".....Not using a
Frame
> Relay, IPX, or ISL for VLAN's on Ethernet ports. There seems to be enough
> information in the books to configure Subinterfaces and set Frame
Encapsulation
> Types for those purposes, but not for basic IP routing. My problems start
when
> I set up Subinterfaces on the Serial Ports with IP Addresses, set the
clocking,
> and then bring up the interfaces. When I look at them on each router,
they all
> show as Up and Line Protocol up - But I just can't seem to Ping any of the
IP's
> on the Serial ports if they, or the other end they are attached to, are
> Subinterfaces. If I can't Ping I sure can't route right? When I stick to
> regular physical interfaces, everything works great. Am I missing
something
> important? If any of you Cisco Experts out there could offer any
suggestions,
> I would hugely appreciate it. I'm kind of stuck on Stall right now and
can't
> move on to any of the other Labs until I resolve this. Thanks.
>
> Rich.
>
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