Mailing List Archive: Cisco: VOIP

Proper VLANS and IPs

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j23paul at gmail

Sep 30, 2008, 5:47 AM

Post #1 of 8 (252 views)
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Proper VLANS and IPs

I have inherited this project from a project manager who just left with no
warning. I always noticed he and I did things a bit differently, but this
one has me stumped.

4 buildings, linked by fiber. CCM 6.1 and Unity. 2801s for SRST and 911 in
each building. 10-15 phones per building, so total of 60 (actual total
shows 52).

He has CCM and Unity in VLAN 7 in the .7 subnet.
Phones are in VLAN 6 and in the .6 subnet.

Doesn't this mean that for each packet in the voice stream, we will have to
traverse the router to get to the diff subnet? Is this common to do it this
way, leaving CCM and Unity in their own subnet and VLAN? If the main router
were to have an issue, all phone traffic would die, it seems.

Data is in VLAN 1 in the .1 subnet.

Depending on who I get in TAC, this is either fine,or troubling, since
Cisco's mgt traffic uses VLAN1. But with only about 50 users, so figure 50
PCs, would this be an issue running the data on VLAN1?

Your thoughts?

lelio at uoguelph

Sep 30, 2008, 5:57 AM

Post #2 of 8 (243 views)
Permalink

Re: Proper VLANS and IPs [In reply to]

There's nothing wrong with using different VLANs for voice, servers and data.

Using VLAN 1 for anything should likely be avoided though since that is the default VLAN if trunking goes awry.

---
Lelio Fulgenzi, B.A.
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
"Bad grammar makes me [sic]" - Tshirt

----- Original Message -----
From: "Jay Prailun" <j23paul[at]gmail.com>
To: cisco-voip[at]puck.nether.net
Sent: Tuesday, September 30, 2008 8:47:32 AM GMT -05:00 US/Canada Eastern
Subject: [cisco-voip] Proper VLANS and IPs

I have inherited this project from a project manager who just left with no warning. I always noticed he and I did things a bit differently, but this one has me stumped.

4 buildings, linked by fiber. CCM 6.1 and Unity. 2801s for SRST and 911 in each building. 10-15 phones per building, so total of 60 (actual total shows 52).

He has CCM and Unity in VLAN 7 in the .7 subnet.
Phones are in VLAN 6 and in the .6 subnet.

Doesn't this mean that for each packet in the voice stream, we will have to traverse the router to get to the diff subnet? Is this common to do it this way, leaving CCM and Unity in their own subnet and VLAN? If the main router were to have an issue, all phone traffic would die, it seems.

Data is in VLAN 1 in the .1 subnet.

Depending on who I get in TAC, this is either fine,or troubling, since Cisco's mgt traffic uses VLAN1. But with only about 50 users, so figure 50 PCs, would this be an issue running the data on VLAN1?

Your thoughts?

_______________________________________________ cisco-voip mailing list cisco-voip[at]puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-voip

COrtiz at sscincorporated

Sep 30, 2008, 6:02 AM

Post #3 of 8 (232 views)
Permalink

Re: Proper VLANS and IPs [In reply to]

I think this is a very common configuration. Typically you would also
have another router running HSRP (or similar) at the core to mitigate
the "main router" failure issue.

Carlos

________________________________

From: cisco-voip-bounces[at]puck.nether.net
[mailto:cisco-voip-bounces[at]puck.nether.net] On Behalf Of Jay Prailun
Sent: Tuesday, September 30, 2008 8:48 AM
To: cisco-voip[at]puck.nether.net
Subject: [cisco-voip] Proper VLANS and IPs

I have inherited this project from a project manager who just left with
no warning. I always noticed he and I did things a bit differently, but
this one has me stumped.

4 buildings, linked by fiber. CCM 6.1 and Unity. 2801s for SRST and
911 in each building. 10-15 phones per building, so total of 60 (actual
total shows 52).

He has CCM and Unity in VLAN 7 in the .7 subnet.
Phones are in VLAN 6 and in the .6 subnet.

Doesn't this mean that for each packet in the voice stream, we will have
to traverse the router to get to the diff subnet? Is this common to do
it this way, leaving CCM and Unity in their own subnet and VLAN? If the
main router were to have an issue, all phone traffic would die, it
seems.

Data is in VLAN 1 in the .1 subnet.

Depending on who I get in TAC, this is either fine,or troubling, since
Cisco's mgt traffic uses VLAN1. But with only about 50 users, so
figure 50 PCs, would this be an issue running the data on VLAN1?

Your thoughts?

smetsysocsic at gmail

Sep 30, 2008, 7:35 AM

Post #4 of 8 (232 views)
Permalink

Re: Proper VLANS and IPs [In reply to]

If a client says that there is even a remote chance that they may
someday physically move their voice servers to another campus or
building (across a WAN link), we'll put the servers in their own
"voice server" vlan separate from the phones, so that if they
physically move the servers, we simply move the whole voice server
subnet rather than going thru the hassle of re-addressing the servers
with new IPs.

-Joe C.

On Tue, Sep 30, 2008 at 7:47 AM, Jay Prailun <j23paul[at]gmail.com> wrote:
> I have inherited this project from a project manager who just left with no
> warning. I always noticed he and I did things a bit differently, but this
> one has me stumped.
>
> 4 buildings, linked by fiber. CCM 6.1 and Unity. 2801s for SRST and 911 in
> each building. 10-15 phones per building, so total of 60 (actual total
> shows 52).
>
> He has CCM and Unity in VLAN 7 in the .7 subnet.
> Phones are in VLAN 6 and in the .6 subnet.
>
> Doesn't this mean that for each packet in the voice stream, we will have to
> traverse the router to get to the diff subnet? Is this common to do it this
> way, leaving CCM and Unity in their own subnet and VLAN? If the main router
> were to have an issue, all phone traffic would die, it seems.
>
> Data is in VLAN 1 in the .1 subnet.
>
> Depending on who I get in TAC, this is either fine,or troubling, since
> Cisco's mgt traffic uses VLAN1. But with only about 50 users, so figure 50
> PCs, would this be an issue running the data on VLAN1?
>
> Your thoughts?
>
> _______________________________________________
> cisco-voip mailing list
> cisco-voip[at]puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
>
_______________________________________________
cisco-voip mailing list
cisco-voip[at]puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip

rwest at zyedge

Sep 30, 2008, 7:35 AM

Post #5 of 8 (234 views)
Permalink

Re: Proper VLANS and IPs [In reply to]

Are you sure that the router is performing inter VLAN routing (router on a stick)? Layer 3 switching is pretty typical as well.

-ryan

From: cisco-voip-bounces[at]puck.nether.net [mailto:cisco-voip-bounces[at]puck.nether.net] On Behalf Of Carlos Ortiz
Sent: Tuesday, September 30, 2008 9:03 AM
To: Jay Prailun; cisco-voip[at]puck.nether.net
Subject: Re: [cisco-voip] Proper VLANS and IPs

I think this is a very common configuration. Typically you would also have another router running HSRP (or similar) at the core to mitigate the "main router" failure issue.

Carlos

________________________________
From: cisco-voip-bounces[at]puck.nether.net [mailto:cisco-voip-bounces[at]puck.nether.net] On Behalf Of Jay Prailun
Sent: Tuesday, September 30, 2008 8:48 AM
To: cisco-voip[at]puck.nether.net
Subject: [cisco-voip] Proper VLANS and IPs

I have inherited this project from a project manager who just left with no warning. I always noticed he and I did things a bit differently, but this one has me stumped.

4 buildings, linked by fiber. CCM 6.1 and Unity. 2801s for SRST and 911 in each building. 10-15 phones per building, so total of 60 (actual total shows 52).

He has CCM and Unity in VLAN 7 in the .7 subnet.
Phones are in VLAN 6 and in the .6 subnet.

Doesn't this mean that for each packet in the voice stream, we will have to traverse the router to get to the diff subnet? Is this common to do it this way, leaving CCM and Unity in their own subnet and VLAN? If the main router were to have an issue, all phone traffic would die, it seems.

Data is in VLAN 1 in the .1 subnet.

Depending on who I get in TAC, this is either fine,or troubling, since Cisco's mgt traffic uses VLAN1. But with only about 50 users, so figure 50 PCs, would this be an issue running the data on VLAN1?

Your thoughts?

lemon at lemon

Sep 30, 2008, 7:44 AM

Post #6 of 8 (232 views)
Permalink

Re: Proper VLANS and IPs [In reply to]

On Tue, Sep 30, 2008 at 1:57 PM, Lelio Fulgenzi <lelio[at]uoguelph.ca> wrote:
> There's nothing wrong with using different VLANs for voice, servers and
> data.
>

fairly common practise......in fact I sometimes suggest different
voice vlans (one per closet) & same for data. and setup a management
vlan for switches (not vlan 1)

thnx
charl
_______________________________________________
cisco-voip mailing list
cisco-voip[at]puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip

khalid_khursheed at hotmail

Oct 4, 2008, 1:12 AM

Post #7 of 8 (195 views)
Permalink

Re: Proper VLANS and IPs [In reply to]

Hi all,

Just a recommendation, when ever configuring Voice VLANs, put them in lower numbers because when STP converges in case of failure, the vlans with lower number converges first.

Thanks
Khalid

> Date: Tue, 30 Sep 2008 15:44:10 +0100
> From: lemon[at]lemon.za.net
> To: cisco-voip[at]puck.nether.net
> Subject: Re: [cisco-voip] Proper VLANS and IPs
>
> On Tue, Sep 30, 2008 at 1:57 PM, Lelio Fulgenzi <lelio[at]uoguelph.ca> wrote:
> > There's nothing wrong with using different VLANs for voice, servers and
> > data.
> >
>
> fairly common practise......in fact I sometimes suggest different
> voice vlans (one per closet) & same for data. and setup a management
> vlan for switches (not vlan 1)
>
> thnx
> charl
> _______________________________________________
> cisco-voip mailing list
> cisco-voip[at]puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip

_________________________________________________________________
News, entertainment and everything you care about at Live.com. Get it now!
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MLouis at nwnit

Oct 5, 2008, 6:31 AM

Post #8 of 8 (181 views)
Permalink

Re: Proper VLANS and IPs [In reply to]

How much of a difference does this make? I have never seen this documented. Do you have a link to this information?

________________________________
From: Syed Khalid Ali <khalid_khursheed[at]hotmail.com>
Sent: Saturday, October 04, 2008 4:14 AM
To: lemon[at]lemon.za.net <lemon[at]lemon.za.net>; cisco-voip[at]puck-nether.net <cisco-voip[at]puck.nether.net>
Subject: Re: [cisco-voip] Proper VLANS and IPs

Hi all,

Just a recommendation, when ever configuring Voice VLANs, put them in lower numbers because when STP converges in case of failure, the vlans with lower number converges first.

Thanks
Khalid

> Date: Tue, 30 Sep 2008 15:44:10 +0100
> From: lemon[at]lemon.za.net
> To: cisco-voip[at]puck.nether.net
> Subject: Re: [cisco-voip] Proper VLANS and IPs
>
> On Tue, Sep 30, 2008 at 1:57 PM, Lelio Fulgenzi <lelio[at]uoguelph.ca> wrote:
> > There's nothing wrong with using different VLANs for voice, servers and
> > data.
> >
>
> fairly common practise......in fact I sometimes suggest different
> voice vlans (one per closet) & same for data. and setup a management
> vlan for switches (not vlan 1)
>
> thnx
> charl
> _______________________________________________
> cisco-voip mailing list
> cisco-voip[at]puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip

________________________________
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