Hi,

can anyone help w/ this strange configuration I need?:

1.I want to configure one physical interface of my cisco router (I
have 2600 and Layer-3 3550) to have 2 differnt IP addresses (different
subnets). Is it possible?

2.I want to configure 2 interfaces on my cisco router with IP
addresses from the same subnet. Is it possible? will the router know
to switch the traffic between its ports?


thanks,

wd.

* alfa_b wrote:
(conf-if)# ip addr xxx yyy secondary

man bridge-group.

In article <744ebc2b.0409200931.40674d62@posting.google.com>, tm7765
@yahoo.com says...
two options. Use secondary address on the major interface.

int fa0/0
ip addr blah
ip addr blah-1 secondary

Or you can use dot1q trunking. This works in conjunction with your 3550 switch.

You don't want to do this. But if you must, look up "IRB" on Cisco.com

--

hsb

"Somehow I imagined this experience would be more rewarding" Calvin
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alfa_b wrote:

Sure. Look at 'ip addresss ... secondary' if they may share a broadcast
domain, at 802.1Q VLAN trunking and subinterfaces if not.

No. Not if your're routing between the interfaces at least; if you're
bridging between them, perhaps. Never tried it.

Regards,

Marco.

ok, thnx,

can you elaborate more about the 3550 vlan option?

I have a machine that has 3 IP interfaces (different nets) but only
one physical I/F. the machine does not know to tag frames.

on the other hand I have those 3 networks my machine has interafces
on, and I want to connect them. I have 3550, 2600, but I can't find a
good solution for that...how can I utilize the fact that my machine
sends packets on 3 networks to make the 3550/2600 seperate them and
take them to their correct network???

any idea?

thnx again,
wd

Hansang Bae <uonr@alp.ee.pbz> wrote in message news:<MPG.1bb8e439f12dc241989e40@news-server.nyc.rr.com>...

In article <744ebc2b.0409201411.6b781d3d@posting.google.com>, tm7765
@yahoo.com says...

If your machine cannot tag frames, then you cannot use vlans with 3550.
Separating out the traffic with your 2600 won't make much sense since
your end device does not know how to tag the frames.

Your best bet (other than making the server vlan aware) is to use two
secondary addressing so that you can have all three IP subnets (one
primary and two secondary) on the same physical network. I would also
add "ip route-cache same-interface" on the Fastethernet servicing these
three subnets.

--

hsb

"Somehow I imagined this experience would be more rewarding" Calvin
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