Vlans trunking fiber optic connection

mitchamrict · ‎03-30-2012

Hello All,

At a customer of us we have te following problem. I tried some things but it still doesn't work.

There a 2 locations connected through a fiber optic connection (both sides a fiber optic cisco switch). Those switches are from a ISP and we can't login on those. THe ports should be transparant on both. On both sides we have a cisco 2960 with a trunk port configured. The fiber optic is connected on the trunk port on both sides. The data VLAN 1 is working fine. Can reach both sides. On one side i placed a UC560 with a VLAN 100 10.1.1.x. On the sides where the fiber optic connection begins it works fine. On the other side i can't reach the vlan 100 ip adresses. I made ofcourse on both switches an interface vlan 100 with an ip address. The switch on the side where the uc560 is NOT connected i'm able to ping the uc560 on 10.1.1.1 (ip address of it). From the side where the uc560 is i can't ping tot the vlan 100 address of the switch on the other side.

When i check the arp table on the switch without the uc560 on it i see the following.

Protocol Address Age (min) Hardware Addr Type Interface

Internet 10.1.1.1 157 2894.0f32.66e2 ARPA Vlan1

Internet 10.1.1.36 - 08d0.9fdd.e3c2 ARPA Vlan100

Internet 10.1.1.135 157 2894.0f32.66e2 ARPA Vlan1

Internet 10.1.1.137 157 2894.0f32.66e2 ARPA Vlan1

Internet 192.168.1.10 0 e8b7.487b.9a4c ARPA Vlan1

Internet 192.168.1.11 0 e8b7.487b.99f8 ARPA Vlan1

Internet 192.168.1.35 157 6c9c.eddc.f9c0 ARPA Vlan1

Internet 192.168.1.36 - 08d0.9fdd.e3c0 ARPA Vlan1

The problem is that the 10.1.1.x adress on the other side are reachable on VLAN1, that must be VLAN100.

On the switch on the UC560 side i see the following:

Protocol Address Age (min) Hardware Addr Type Interface

Internet 10.1.1.1 95 2894.0f32.66e2 ARPA Vlan100

Internet 10.1.1.135 - 6c9c.eddc.f9c1 ARPA Vlan100

Internet 10.1.1.137 95 0c85.256f.1cc1 ARPA Vlan100

Internet 192.168.1.2 173 2894.0f32.66e2 ARPA Vlan1

Internet 192.168.1.10 0 e8b7.487b.9a4c ARPA Vlan1

Internet 192.168.1.11 0 e8b7.487b.99f8 ARPA Vlan1

Internet 192.168.1.35 - 6c9c.eddc.f9c0 ARPA Vlan1

Internet 192.168.1.36 173 08d0.9fdd.e3c0 ARPA Vlan1

Internet 192.168.1.37 173 0c85.256f.1cc0 ARPA Vlan1

Internet 192.168.1.254 18 0009.0f42.214b ARPA Vlan1

Internet 192.168.100.35 - 6c9c.eddc.f9c2 ARPA Vlan200

The 10.1.1.36 isn't in it.

I hope that someone can tell me what do to make vlan 100 reachable for both sides.

Thx in advance

paolo bevilacqua · ‎03-31-2012

Ask ISP if the can please enable VLAN trunking.

If they can't, or won't, you will have to use a single VLAN for the remote site. That It's not a big deal really.

mitchamrict · ‎03-31-2012

Thanks for the answer.

How do you mean when they won't enable vlan trunking to use a single VLAN for the remote site?

I only have one connection on both sides. Otherwise i made on both sides a port with only vlan100 on it.

Arturo Bianchi · ‎03-31-2012

Hi Mitch,

I think you could use a GRE tunnel to route traffic between two locations; now I don't have the details in handy, but I could be a solution ... otherwise simply declare the phones as a "Teleworker phone" and use WAN/LAN IP to reach UC500... on other site, in any case, you can use VLAN and a local DHCP with "option 150 ip cmeip.cmeip.cmeip.cmeip" to point to UC device...

NB: personally, if I use geographic line even if short, however, would draw on an encrypted vpn.

73,

Arturo.

paolo bevilacqua · ‎03-31-2012

Correct. Note ISP currently do not carry VLANs so your only VLAN will likekly be VLAN 1.

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mitchamrict · ‎04-01-2012

Ty paolo for the answer.

But how does a vlan 1 with a data range can communicatie with a vlan20 voice range on the otherside?

Does this not create problems for biderectional voice? Other side can only hear the caller but the caller doesn't hear the called person?

paolo bevilacqua · ‎04-01-2012

In short: As long you have IP connectivity, there is no problem.

VLAN, "ranges" as you call subnetting, require some stuidying and experience to be fully understood.

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