Solved

Cisco 3550 VLANs, Trunking & Routing

Posted on 2013-10-23
13
660 Views
Last Modified: 2013-10-28
I have been tasked with creating the following scenario on a Cisco 3550.  We are using all public address.  

Setup Management VLAN with a /30

Setup 4 separate VLANs with a /29

VLAN Config  ::  (IP Addresses Changed to protect the innocent)

Management (VLAN1)  177.205.12.24/30
VLAN 3  ::  177.205.27.224/29     (Ports 5 - 9)
VLAN 4  ::  177.205.27.240/29     (Ports 10 - 14)
VLAN 5  ::  177.205.27.248/29     (Ports 15 - 19)
VLAN 6  ::  177.205.27.136/29     (Ports 20 - 24)

Port FA0/2 is the uplink to the service provider

So, my questions are these.

1.  After configuring the switch for the VLANS.  How do I trunk the VLANs out the the web?
     a.  Do I need to physically cross connect each VLAN to a VLAN that I create to trunk all traffic to the web?
     b.  Or is there a way to do this in the IOS?

2.  I do not understand why they didn't just go with a /26 and leave all the Machines on 1 sub-net.  What is the logic behind doing something like this with multiple sub-nets on a public switch?
0
Comment
Question by:Daeta42
  • 7
  • 6
13 Comments
 
LVL 26

Expert Comment

by:Soulja
ID: 39595153
Is this 3550 only layer 2? Will it be routing these vlans or just layer 2 to the ISP hardware?
0
 

Author Comment

by:Daeta42
ID: 39595179
If we could route on the switch that would be great using Layer 2.

I would rather get the ISP hardware to do all the routing if possible.
0
 
LVL 26

Expert Comment

by:Soulja
ID: 39595210
Ok, so if the isp is doing all the routing for the vlans, then you just need to set up a normal trunk to their switch or router

int fa0/2
switchport mode trunk
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,3-6  (optional)
switchport trunk nonnegotiate

You just need to make sure you know the setting on the ISP side.

The only reason I can see them doing this is to be able to control security/access between the different vlans.
0
PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

 

Author Comment

by:Daeta42
ID: 39595250
So, we've tried to do all that you said previously.  Here is specifically what we've done.  (We did not do the nonnegotiate command)

int fa0/2
switchport mode trunk
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 6

This did not work...  

In testing we just enabled ip-routing and lost access to the site it seems.  Looks like we have to go onsite to get us remote access again.

I could see doing this for security / access between different VLANS if they were all private addresses.  But we are working off public addresses.  So, there's no security / access control to the IPs....
0
 
LVL 26

Expert Comment

by:Soulja
ID: 39595262
if the switch is only layer 2, you need to disable ip routing.

conf t
no ip routing


Also, by only allowing vlan 6, I assume you knocked out the management vlan.

Can you post the switch config?
0
 

Author Comment

by:Daeta42
ID: 39595299
We are heading to the site right now and will post the switch config in an hour or so.
0
 
LVL 26

Expert Comment

by:Soulja
ID: 39595366
Do you have the ISP config also?
0
 

Author Comment

by:Daeta42
ID: 39595427
As in what the IP assignments are, default gateway, subnet mask,  etc.?   Then yes.
0
 

Author Comment

by:Daeta42
ID: 39595589
Here is the running Config.

 
Building configuration...

Current configuration : 3823 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname DL-3550
!
enable secret 5 $1$fdsfd0
enable password fdsafdsafff
!
ip subnet-zero
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
!
!
interface FastEthernet0/1
 no ip address
!
interface FastEthernet0/2
 switchport access vlan 6
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,3-6
 switchport mode trunk
 no ip address
!
interface FastEthernet0/3
 no ip address
!
interface FastEthernet0/4
 no ip address
!
interface FastEthernet0/5
 switchport access vlan 3
 no ip address
!
interface FastEthernet0/6
 switchport access vlan 3
 no ip address
!
interface FastEthernet0/7
 switchport access vlan 3
 no ip address
!
interface FastEthernet0/8
 switchport access vlan 3
 no ip address
!
interface FastEthernet0/9
 switchport access vlan 3
 no ip address
!
interface FastEthernet0/10
 switchport access vlan 4
 no ip address
!
interface FastEthernet0/11
 switchport access vlan 4
 no ip address
!
interface FastEthernet0/12
 switchport access vlan 4
 no ip address
!
interface FastEthernet0/13
 switchport access vlan 4
 no ip address
!
interface FastEthernet0/14
 switchport access vlan 4
 no ip address
!
interface FastEthernet0/15
 switchport access vlan 5
 no ip address
!
interface FastEthernet0/16
 switchport access vlan 5
 no ip address
!
interface FastEthernet0/17
 switchport access vlan 5
 no ip address
!
interface FastEthernet0/18
 switchport access vlan 5
 no ip address
!
interface FastEthernet0/19
 switchport access vlan 5
 no ip address
!
interface FastEthernet0/20
 switchport access vlan 6
 switchport mode access
 no ip address
!
interface FastEthernet0/21
 switchport access vlan 6
 switchport mode access
 no ip address
!
interface FastEthernet0/22
 switchport access vlan 6
 switchport mode access
 no ip address
!
interface FastEthernet0/23
 switchport access vlan 6
 switchport mode access
 no ip address
!
interface FastEthernet0/24
 switchport access vlan 6
 switchport mode access
 no ip address
!
interface FastEthernet0/25
 no ip address
!
interface FastEthernet0/26
 no ip address
!
interface FastEthernet0/27
 no ip address
!
interface FastEthernet0/28
 no ip address
!
interface FastEthernet0/29
 no ip address
!
interface FastEthernet0/30
 no ip address
!
interface FastEthernet0/31
 no ip address
!
interface FastEthernet0/32
 no ip address
!
interface FastEthernet0/33
 no ip address
!
interface FastEthernet0/34
 no ip address
!
interface FastEthernet0/35
 no ip address
!
interface FastEthernet0/36
 no ip address
!
interface FastEthernet0/37
 no ip address
!
interface FastEthernet0/38
 no ip address
!
interface FastEthernet0/39
 no ip address
!
interface FastEthernet0/40
 no ip address
!
interface FastEthernet0/41
 no ip address
!
interface FastEthernet0/42
 no ip address
!
interface FastEthernet0/43
 no ip address
!
interface FastEthernet0/44
 no ip address
!
interface FastEthernet0/45
 no ip address
!
interface FastEthernet0/46
 no ip address
!
interface FastEthernet0/47
 no ip address
!
interface FastEthernet0/48
 no ip address
!
interface GigabitEthernet0/1
 no ip address
!
interface GigabitEthernet0/2
 no ip address
!
interface Vlan1
 ip address 177.205.16.26 255.255.255.252
 no ip route-cache
!
interface Vlan3
 ip address 177.205.23.226 255.255.255.248
 no ip route-cache
!
interface Vlan4
 ip address 177.205.23.242 255.255.255.248
 no ip route-cache
!
interface Vlan5
 ip address 177.205.23.250 255.255.255.248
 no ip route-cache
!
interface Vlan6
 ip address 177.205.23.138 255.255.255.248
 no ip route-cache
!
ip default-gateway 177.205.16.25
ip classless
ip http server
!
!
!
line con 0
line vty 0 4
 password fdsafdsafdsa!
 login
line vty 5 15
 password fdsafdsads
 login
!
end

Open in new window

0
 
LVL 26

Assisted Solution

by:Soulja
Soulja earned 500 total points
ID: 39595734
I thought this switch was layer 2 only? Based on your config you are trying to use it as layer3. If so you need to configure ip  routing and ad a default route
ip route 0.0.0.0 0.0.0.0  x.x.x.x
x being isp next hop
Als
Can you provide the isp's switch interface config? Are you connecting to a switch or router?
0
 

Author Comment

by:Daeta42
ID: 39595747
We are connecting to the Colo's Router.  (Betting there is a switch in between)  But I do not have access to their devices.  

I will get the IP route command in there right now and test.
0
 
LVL 26

Accepted Solution

by:
Soulja earned 500 total points
ID: 39595818
Ok, if you are infact going to enable routing there are some considerations and configuration changes.

1.  I would change fa0/2 to an access port for vlan 1 since your next hop is part of that same subnet.

Enable routing -  ip routing

2. Add ip route 0.0.0.0 0.0.0.0 177.205.16.25

3. remove ip default gateway 177.205.16.25

no ip default-gateway 177.205.16.25

The big question is do the colo router have a route back to your switch.
0
 

Author Closing Comment

by:Daeta42
ID: 39605834
Thank you for your assistance!  I've never used the switch to do routing before so I was a bit lost!

Cheers!
0

Featured Post

Portable, direct connect server access

The ATEN CV211 connects a laptop directly to any server allowing you instant access to perform data maintenance and local operations, for quick troubleshooting, updating, service and repair.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Meet the world's only “Transparent Cloud™” from Superb Internet Corporation. Now, you can experience firsthand a cloud platform that consistently outperforms Amazon Web Services (AWS), IBM’s Softlayer, and Microsoft’s Azure when it comes to CPU and …
In this article, I am going to show you how to simulate a multi-site Lab environment on a single Hyper-V host. I use this method successfully in my own lab to simulate three fully routed global AD Sites on a Windows 10 Hyper-V host.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question