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Help: Vlan traffic cant reach router exit interface

rob.holyhead1
Level 1
Level 1

‎03-24-2016 04:56 PM - edited ‎03-08-2019 05:06 AM

Hi all,

I'm here as some what of a last resort, I have a network brief to implement involving OSPF, and VLAN routing, its 4 router-on-a-stick networks connected by a backbone switch. with each router-on-a-stick network consisting of 3 sub-networks each belonging to vlan 1, 2, or 3 so far:

  • all router-switch interfaces are in trunk mode
  • all switch to workstations are in mode access
  • all routers configured with dot1q on relevant sub-interfaces
  • all vlans are configured on all switch's
  • workstations are manually assigned IP's
  • all my ospf routers are able to see all advertised networks
  • all backbone connectivity is fine
  • there are no port security measures anywhere

However I have come across an issue where as my workstations cannot reach the backbone interface of their routers, so vlans on separate networks cant ping each other.

I don't want to resort to posting my code, but i wondered if anyone could offer me some advice on what I could possibly have missed?

Thanks very much!

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2 Replies 2

Carlos Villagran
Cisco Employee
Cisco Employee

‎03-24-2016 05:55 PM

Hi Rob,

What I understand is you want to use ROAS and InterVLAN routing at the same time?

- What are your hosts using as gateway?

- Is your switch able to ping the routers?

Regards!

JC

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rob.holyhead1
Level 1
Level 1
In response to Carlos Villagran

‎03-25-2016 05:49 AM

Hi Carlos

Yes that is correct, my hosts do not have a gateway, I have played around with this idea I'm going to try again today, I'm unsure if an interface can be 'dual use' i.e. an address for Gi0/0 and also use addresses for Gi0/0.X.

This as a possible solution is beyond the scope of learning so far, and my switch can ping the routers sub interface's.

I apologize for being so vague, but I don't want to be given the solution if you understand, I just want to explore possibility's I may have missed :)

Thank you!

Update Edit: It appears that interfaces can use their main interface and sub interface simultaneously! I think after scratching my head for so long I've let my lack of confidence hold me back a little and I'm more capable then I give myself credit for :)

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