alt.certification.cisco

Author

Networking

Dheeraj

2003-01-27, 10:24 am

Hi

Can I share one segment ethernet interface between two network
segments.
I am running out of ports on Cisco routers one option is buy another
router or have one interface share traffic between two different
network segments.

Like eth0 is sharing two network segment 10.1.11.0/24 and
10.1.12.0/24.

I really dount but if there is a way around without getting involved
with too many ACLs or static routes to isolate traffic please Iwould
like to know.

Thanks

Dheeraj

Keith W. McCammon

2003-01-27, 11:24 am

> Like eth0 is sharing two network segment 10.1.11.0/24 and
> 10.1.12.0/24.

You could give the interface a secondary address, although you may
experience some minor complications. See the thread
http://groups.google.com/groups?hl=...ewwindow=1&th=d
3cecd2656fad23e&seekm=9dc1f0a6.0301270326.356050c%40posting.google.com&frame
=off -- similar issue. And never mind the fact that I sent a completely
boneheaded reply...

Jim

2003-01-27, 1:23 pm

You can add a secondary address, but that means always routing between the
two subnets. IMO, a better way to do this would be to use a different
subnet mask, which would allow for more hosts. Unfortunately, the addresses
that you have don't work well for expanding the mask, but if you don't mind
moving some of your addresses, then it could work well.

For example....

10.1.10.0/23 gives you 10.1.10.0-10.1.11.255
or
10.1.12.0/23 gives you 10.1.12.0-10.1.13.255

Hope that helps,

Jim

"Dheeraj" <dheeraj.khanna@comverse.com> wrote in message
news:e950ebd3.0301270810.1ee79cd5@posting.google.com...
> Hi
>
> Can I share one segment ethernet interface between two network
> segments.
> I am running out of ports on Cisco routers one option is buy another
> router or have one interface share traffic between two different
> network segments.
>
> Like eth0 is sharing two network segment 10.1.11.0/24 and
> 10.1.12.0/24.
>
> I really dount but if there is a way around without getting involved
> with too many ACLs or static routes to isolate traffic please Iwould
> like to know.
>
> Thanks
>
> Dheeraj

shope

2003-01-27, 2:24 pm

"Dheeraj" <dheeraj.khanna@comverse.com> wrote in message
news:e950ebd3.0301270810.1ee79cd5@posting.google.com...
> Hi
>
> Can I share one segment ethernet interface between two network
> segments.

If you have VLAN capable routers and switches, then you could use 802.1q
VLANs to split the subnets.

requirement on the router is a unit with 802.1q capable h/w (any 17xx ecept
1720 or 1710, 26xx and up with a 10/100 Ethernet port).

You need IOS Plus on a 26xx for this - the software needed will vary
depending on the router range.

Once you have this you configure subinterfaces on the ethernet port for each
subnet, and set it up to talk to the corresponding VLAN.

See
http://www.cisco.com/en/US/products...008007cd23.html

> I am running out of ports on Cisco routers one option is buy another
> router or have one interface share traffic between two different
> network segments.
>
> Like eth0 is sharing two network segment 10.1.11.0/24 and
> 10.1.12.0/24.
>
> I really dount but if there is a way around without getting involved
> with too many ACLs or static routes to isolate traffic please Iwould
> like to know.
>
> Thanks
>
> Dheeraj
--
Regards

Stephen Hope - remove xx from email to reply

andy

2003-01-28, 5:23 pm

Hi,

Yes,
You could put up sub interfaces on the same interface. In that case You have
to put on bridge interfaces (BVI) on the router, if the IOS let you. As I
see it its better to use subinterfaces than secondary addresses because the
subinterfaces can act as a router between different vlans and also so You
can put up seperate access-lists and other functions for each subinterface.

Andy

"Dheeraj" <dheeraj.khanna@comverse.com> skrev i meddelandet
news:e950ebd3.0301270810.1ee79cd5@posting.google.com...
> Hi
>
> Can I share one segment ethernet interface between two network
> segments.
> I am running out of ports on Cisco routers one option is buy another
> router or have one interface share traffic between two different
> network segments.
>
> Like eth0 is sharing two network segment 10.1.11.0/24 and
> 10.1.12.0/24.
>
> I really dount but if there is a way around without getting involved
> with too many ACLs or static routes to isolate traffic please Iwould
> like to know.
>
> Thanks
>
> Dheeraj

Joel Salminen

2003-01-30, 12:23 am

Also, it has been my experience thus far (at least through IOS 11) that you
are required to use 100mb speed if you attempt to configure vlan subifs.

"shope" <stephen_hope@xx.ntlworld.com> wrote in message
news:T1gZ9.79$Uo5.998@newsfep4-gui.server.ntli.net...
> "Dheeraj" <dheeraj.khanna@comverse.com> wrote in message
> news:e950ebd3.0301270810.1ee79cd5@posting.google.com...
> > Hi
> >
> > Can I share one segment ethernet interface between two network
> > segments.
>
> If you have VLAN capable routers and switches, then you could use 802.1q
> VLANs to split the subnets.
>
> requirement on the router is a unit with 802.1q capable h/w (any 17xx
ecept
> 1720 or 1710, 26xx and up with a 10/100 Ethernet port).
>
> You need IOS Plus on a 26xx for this - the software needed will vary
> depending on the router range.
>
> Once you have this you configure subinterfaces on the ethernet port for
each
> subnet, and set it up to talk to the corresponding VLAN.
>
> See
>
http://www.cisco.com/en/US/products..._configuration_
guide_chapter09186a008007cd23.html
>
>
>
> > I am running out of ports on Cisco routers one option is buy another
> > router or have one interface share traffic between two different
> > network segments.
> >
> > Like eth0 is sharing two network segment 10.1.11.0/24 and
> > 10.1.12.0/24.
> >
> > I really dount but if there is a way around without getting involved
> > with too many ACLs or static routes to isolate traffic please Iwould
> > like to know.
> >
> > Thanks
> >
> > Dheeraj
> --
> Regards
>
> Stephen Hope - remove xx from email to reply
>
>

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