The 3 layer hierarchy deals more with the switch design rather than the router design. In that scenario your l2 switch is likely the access layer and your l3 switch is a core/distribution layer. The router probably attaches at the distribution layer.
If you go look at figure 7-1 in this link, it gives a pretty good picture of the hierarchy. http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/Baseline_Security/sec_chap7.html Like I said, I think the main WAN connections (routers, firewalls) generally attach to the distribution layer somewhere, but could possibly attach to the core layer. On Fri, Mar 4, 2011 at 8:17 AM, Narendra <[email protected]> wrote: > i just want to say > i have a connectivity like this ; > > ------------router--------------- > | > | > -----------l3 switch------------------- > | > | > ----------l2 switches---------------- > > i m using 12 vlans and intervlan routing is being performed by l3 switch > and > access list has been implemented in l3 switch > > now tell me that > > whichone device is in core layer > whichone device is in distribution layer > i know about the access layer. > i m so much confuse in this model becoz i dont know the clear functions of > the distribution and core layer > > On Fri, Mar 4, 2011 at 7:16 PM, Ananthan <[email protected]> wrote: > > > Sorry Naren, > > > > I miss understood.. > > > > > > On Fri, Mar 4, 2011 at 5:09 PM, Narendra <[email protected]> wrote: > > > >> hi anathan > >> > >> i tried to understand difference between distribution layer and core > >> layer, > >> and what the devices are used in these layer, > >> but i could not get the exact point. > >> > >> kindly explain about these layers > >> > >> > >> regards > >> Narendra > >> > >> On Fri, Mar 4, 2011 at 1:49 PM, Ananthan <[email protected]> wrote: > >> > >>> You can go through CCNP Switch study guide and cisco LAN switching > >>> configuration guide.. > >>> > >>> -Ananthan > >>> > >>> > >>> On Mar 4, 2011, at 2:56 PM, Narendra <[email protected]> wrote: > >>> > >>> > i have recently finished my todd lammle book > >>> > but now i want to have more knowledge about layer 2 and layer3 > >>> switching > >>> > concept > >>> > that's why i need the name and edition of the the other books > >>> > kindly suggest me the reference books for switching > >>> > > >>> > -- > >>> > Best Regards, > >>> > > >>> > Narendra Prasad > >>> > _______________________________________________ > >>> > For more information regarding industry leading CCIE Lab training, > >>> please visit www.ipexpert.com > >>> > >> > >> > >> > >> -- > >> Best Regards, > >> > >> Narendra Prasad > >> > >> > > > > > -- > Best Regards, > > Narendra Prasad > _______________________________________________ > 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
