Merging Home Network With Cisco Lab

75 pts.
Tags:
Cisco Certified Network Professional
Cisco Routers
Cisco switches
VLAN
VLAN configuration
I currently have 3 Cisco routers, 2 L3 Switches and 4 L2 Switches. I ran a cable from my home Cisco wireless E3000 router to one of my L3 Switches. I converted the switch port that its plugged into as a routed port and to obtain an address using dhcp, which it did grab one. I tested connectivity to the internet by pinging various domains and had success. I created 5 vlans for different functions in my home lab and configured dhcp pools for them as well, and I also excluded the proper amount of addresses. When I connect a PC host into a port configured for that host subnet, it grabs an IP address and I am able to ping the entire multi-area ospf network. I can't however ping the Wireless E 3000 gateway. How can I merge the routed port on the L3 Switch so that all of the vlans can access the internet?

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Hi Santucci4,

To be able to aggregate various VLANs (all of them or only the ones you need) you need to configure a TRUNK.
A TRUNK will aggregate the VLANs you need.
Now regarding your scenario and knowing that by default the E3000 gateway do not support VLANs (correct me if I’m wrong), you might need to change a little your layer 2 topology.
For this to work, you need to aggregate all your VLANs before they’re delivered to E3000. You can do this by putting another router (that supports VLANs) before the E3000 gateway.

Please let us know if you need further help.

Discuss This Question: 7  Replies

 
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  • Sixball
    Concur with Saturno - Since the E3000 is a "Home user" device you'll need another router in between the switches that supports VLANs. You mentioned you had 3 other routers, so simply use your E3000 to feed internet to one of those, and set up a 802.1Q trunk link from THAT router to one of your switches (will need to create sub-interfaces for each vlan) Let the "cisco router" NAT/Route between your LAN and the E3000 and it should work a bit smoother...
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  • Santucci4
    Thanks for your replies, you don't know how much I enjoy collaborating with other engineers. Is this more of what you're talking about. The only thing I guess I'm stuck on, is the Vlans. I made the native vlans on all my devices vlan 6, so if any packets are received with no 802.1q header, they should automatically be sent to that vlan for processing correct? Also, once I make the connection from the cable modem to the first cisco device, I'm assuming that I'm going to have to nat the ip address. Will I need to change any of the configuration on the E3000? Topology
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  • Santucci4
    Sorry I appologize for all the posts; but I'm trying to get a link inserted that will display a diagram of the network so we are on the same page and this site is helping. This will be my last attempt and if it doesn't go through, then I'll see if I can PM you the link. <table style="width:194px;"><tr><td align="center" style="height:194px;background:url(https:///s/c/transparent_album_background.gif) no-repeat left"><a href="https://picasaweb.google.com/Santucci4/Mar102011?feat=embedwebsite"><img src="https://lh5.googleusercontent.com/_MkcvYmG22Ao/TXlIMYU7SQE/AAAAAAAAAkY/5omzTiSn9N0/s160-c/Mar102011.jpg" width="160" height="160" style="margin:1px 0 0 4px;"></a></td></tr><tr><td style="text-align:center;font-family:arial,sans-serif;font-size:11px"><a href="https://picasaweb.google.com/Santucci4/Mar102011?feat=embedwebsite" style="color:#4D4D4D;font-weight:bold;text-decoration:none;">Mar 10, 2011</a></td></tr></table>
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  • saturno
    OK, I saw your network diagram. You'll get all VLANs access the Internet when you configure: 1 - a TRUNK between 2621XM Router Fa0/1 and the port that it connects to the LSSW1 (switch) 2- configure routes to the Internet for each VLAN on the 2621XM Router. Note that a TRUNK is configured differently on a router and on a switch. On a router, you configure a TRUNK adding Sub-Interfaces (to Fa0/1) for each VLAN. On a switch you configure a different port mode (switch port mode trunk) to the specific port the router is connected to. Please let us know if you need further assistance. Saturno
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  • Santucci4
    Okay, so after I configure the trunks and sub-interfaces, how do I maintain the wireless subnet access to the internet. I can't create a sub-int for that network, and I can't see creating a BVI?
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  • saturno
    Well that network (wireless) will be on default VLAN. (there is always a default VLAN) You would only need to provide a route to the Internet for the default VLAN.
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  • Sixball
    or, to save on routing statements, you could just add a "gateway of last resort" statement ( the ip route 0.0.0.0 0.0.0.0 <Ip/Interface>) in the 2600 - that way it shoves all "unknown" traffic to the E-series router for it to forward to the ISP...
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