Re: Does Cisco understand netmask tables?

John W. Temples (john@kuwait.net)
Mon, 16 Sep 1996 23:09:24 +0300 (GMT)

On Mon, 16 Sep 1996, James McKenzie wrote:

> On Mon, 16 Sep 1996 14:33:14 +0300 (), you wrote:
>
> Actualy test it again, you will find that the cisco only routes a
> host specific route or the entire network,

Here's what my Cisco shows in its route tables coming from the PMs:

194.54.235.0 is subnetted (mask is 255.255.255.224), 7 subnets
C 194.54.235.0 is directly connected, Ethernet0
R 194.54.235.32 [120/1] via 194.54.235.1, 00:00:00, Ethernet0
R 194.54.235.64 [120/1] via 194.54.235.2, 00:00:13, Ethernet0
[etc.]

Note that it doesn't show the R routes as host routes, or complain
about variable subnets. This is what I can't understand. If I add a
static route for 194.54.235/24 pointing at one of the PMs, the Cisco
then shows:

C 194.54.235.0/27 is directly connected, Ethernet0
R 194.54.235.32/27 [120/1] via 194.54.235.1, 00:00:09, Ethernet0
R 194.54.235.64/27 [120/1] via 194.54.235.2, 00:00:22, Ethernet0

Host routes for other IPs are shown elsewhere in the route table with a
/32 designation as expected. So why is the Cisco showing a /27 on a
host route?

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