From: Tao Yang (tyang@xxxxxxxxxxxx)
Date: Fri Nov 09 2001 - 11:42:30 GMT-3
Albert,
I think the question is whether the interface or subinterface is in active
state. If the interface's layer 3 is up then you can ping.
For most of duplex circuits like T1 and SM/MM ATM, the interface's layer 2
and 3 protocal can be activated by loopback to the router or crossconnect to
other port.
But the rule does not apply to the Ethernet, if loopback to an Ethernet
port, the interface layer 3 is still down even you can still the light is
on.
My two cents.
Tom
----- Original Message -----
From: "Albert Lu" <albert_ccie@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Friday, November 09, 2001 7:03 AM
Subject: How to ping router's own interfaces?
> Hello All,
>
> When pinging a router's own interface, which interfaces would not reply?
>
> I'm aware of Frame Relay interfaces would not reply to a ping (seems like
> only when not using inverse-arp), and you would need a map statement to
your
> own ip address through a local DLCI. Is there a better way of getting the
> local interface to reply without doing the extra frame map?
>
> I've also found that Tunnel interfaces don't reply to local pings. If
> someone could shed some on why and how I can get it to reply, what would
be
> great.
>
> I know ethernet interfaces will reply to local pings no problems and
> obviously loopbacks.
>
> I'm not sure about the other types of interfaces:
> * Serial (various types of encapsulations)
> * ISDN
> * Token Ring
> * ATM (not sure if this would behave like FR and require extra mapping)
> * Virtual Token Ring (Can't seem to put an IP address on it, so maybe not
> much point)
> * Any more I didn't mention??
>
> Finally, I would like people's opinion of whether proctors would dislike
or
> take marks off for extra frame map statement (or other statements) to get
an
> interface to reply to local pings from itself? The proctor could argue
that
> you were only suppose to do what was asked in the exam, and adding this
> statement/functionality shows that you couldn't follow intstructions.
>
> Regards,
>
> Albert
>
>
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