Hit send too soon... Once I had a customer ask me to create a VLAN in each of their datacenters and route them across an MPLS network. When I spoke with the customer in more detail I found out that what they really wanted was to span VLAN's between the data centers for their vmware implementation so they could use vmotion across data centers. It doesn't hurt to clarify things, you get the correct requirements and hopefully the customer learns something. It's a win-win.
Sometimes it is good to think binary, 0's and 1's ;) Sent from my iPhone On Feb 10, 2011, at 9:20 PM, Matt Hill <[email protected]> wrote: > True... Vlan is an L2 concept used to define broadcast domains. > > Pedantic I know... but if someone comes up to me and talks about how > to "route their vlans" I know immediately what they are talking > about. > > Cheers, > Matt > > CCIE #22386 > CCSI #31207 > > On 11 February 2011 13:13, Rogelio Gamino <[email protected]> wrote: >> VLAN's are not routable. The layer 3 address space (ie. IPv4/6) used within >> a VLAN can be routed but it does not have to be. >> >> When I see the term "unrouted VLAN" I understand that the L3 address space >> used in a VLAN is not to be advertised. >> >> Why would I not want to advertise that L3 space? Not all devices with an L3 >> address space have to be reachable outside that range. When would I use a >> "unrouted VLAN"? When clustering servers, network based backups using >> production network, link between firewalls/load balancers configured in HA >> mode to exchange health status info and sync configs/sessions/etc, iSCSI >> networks, etc. These are just a few examples of "unrouted VLAN's". >> >> In most cases I'd probably use dedicated hardware in an IP based SAN to >> avoid network congestion/STP, better security, etc. I'd recommend to do the >> same with network for back ups. Unfortunately I can't control layers 8 and >> above (ie. money, politics). >> >> >> HTH >> >> >> Sent from my iPhone >> >> On Feb 10, 2011, at 6:46 PM, Matt Hill <[email protected]> wrote: >> >>> NAC Quarantine vlan is a common use for an unrouted vlan. >>> >>> On 11 February 2011 09:48, Matlock, Kenneth L <[email protected]> wrote: >>>> If I had to guess, I'd say the context is something like a load balancer >>>> or such (like the older Cisco Local Director), where the L2 packets must >>>> flow 'through' the chassis. >>>> >>>> What I'd do is have the 'real' VLAN with an SVI, and then a 'dummy' >>>> L2-only (no SVI) VLAN behind the Local Director. The servers 'live' on >>>> the dummy VLAN, and the Local Director acts as a bridge between the two. >>>> >>>> >>>> Ken Matlock >>>> Network Analyst >>>> Exempla Healthcare >>>> (303) 467-4671 >>>> [email protected] >>>> >>>> >>>> >>>> -----Original Message----- >>>> From: [email protected] >>>> [mailto:[email protected]] On Behalf Of Marko >>>> Milivojevic >>>> Sent: Thursday, February 10, 2011 2:40 PM >>>> To: [email protected] >>>> Cc: . >>>> Subject: Re: [OSL | CCIE_RS] Unrouted VLAN >>>> >>>> On Thu, Feb 10, 2011 at 21:04, <[email protected]> wrote: >>>> >>>>> What is a Unrouted VLAN and why would you use? >>>>> >>>> >>>> Could you please give some context for the question? >>>> >>>> -- >>>> Marko Milivojevic - CCIE #18427 >>>> Senior Technical Instructor - IPexpert >>>> >>>> FREE CCIE training: http://bit.ly/vLecture >>>> >>>> Mailto: [email protected] >>>> Telephone: +1.810.326.1444 >>>> Web: http://www.ipexpert.com/ >>>> _______________________________________________ >>>> For more information regarding industry leading CCIE Lab training, >>>> please visit www.ipexpert.com >>>> _______________________________________________ >>>> For more information regarding industry leading CCIE Lab training, please >>>> visit www.ipexpert.com >>>> >>> _______________________________________________ >>> For more information regarding industry leading CCIE Lab training, please >>> visit www.ipexpert.com >> _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
