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Connecting SG300-10 to C1921 router

Hi everybody,

I have a newbie question (I might bein over my head, please be gentle)

My ISP has built a MPLS network for me and all has been simple so far connecting everything together. They have supplied me with C1921 routers and configured the default gateways so I could just program network cards etc to point at the internet. This has all gone well. The final challenge I face is to setup my head office. To me this is a slightly complicated issue as we have four completely seperate domains on site. They all need to talk to each other but each has its own DNS and DHCP.

I was instructed to get a layer 3 managed switch and purchased the SG300-10. The ISP has configured the router (C1921) with four default gateways and tagged each one. I understand the tagging of Vlans and how to allocate the ports. Where i am a little stuck is the interconnection between C1921 and SG300-10 to allow internet connection to all Vlans. I have looked for information everywhere but had little success. The main problem seems to be no connectivity from SG300-10 to router, none of the gateways are pingable from SG300-10. I am guessing my issue is i need to setup a port for the router connection ? How do I achieve this ?

Sorry if this question is a little dumb, never had to use managed switching before and there is a slight learning curve.

I appreciate any help you guys could supply.

Regards

Dave

 

2 REPLIES
VIP Purple

Hey so they have configured 4

Hey so they have configured 4 gateways for each vlan all set under 1 physical interface on the 1921 is that correct ?  If thats the case you only needed a layer 2 switch as its a router and stick setup and your side trunked

Your switch port connecting to the router needs to be a trunk allowing all layer 2 vlans up to it

heres a concept should be easy to follow if thats what they have done.

http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/336-cisco-router-8021q-router-stick.html

If its not that and its pure layer 3 between the router and switch they should have provided more info like the IGP there using so you can form to it

Hello,

Hello,

You need to connect your switch to C1921. I suppose you connect interface GE28 to 1921.

Follow these steps

1-

You need to create 4 VLANs. The VLAN-IDs must be the same as 1921 IDs.

configure terminal

      VLan 10

       vlan 20

       vlan 30

       vlan 40

2-

Interface GE28 [Please check interfaces names ]

descrition connects to 1921

switchport encapsulation dot1q

switchport mode trunk

3- You need to group your computers and assign them to to each VLAN. You may use only one vlan for everyone depending on your policy. I suppose you have 5 computers assigning to VLAN 10. Their default Gateway corresponding to VLAN 10 is set on 1921 .

I suppose 192.168.10.1 255.255.255.0 is set on 1921 for VLAN 10

interface range gi1-5 

switchport mode access

switchport access VLAN 10

[ configure computer 1 IP   192.168.10.2 with default gateway 192.168.10.1]

[ configure computer 2  IP  192.168.10.3 with default gateway 192.168.10.1]

and so on

6 computer in VLAN 20

I suppose 192.168.20.1 255.255.255.0 is set on 1921 for VLAN 20

interface range gi6-11

switchport mode access

switchport access VLAN 20

[ computer 6   192.168.20.2 with default gateway 192.168.20.1]

[ computer 7   192.168.20.3 with default gateway 192.168.20.1]

and so on

You need to countinue addnig other two vlans .

It is very simple.

Hope it helps,

Masoud

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