Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Community Member

Vlans trunking fiber optic connection

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

6 REPLIES
Hall of Fame Super Gold

Vlans trunking fiber optic connection

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.

Community Member

Vlans trunking fiber optic connection

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.

Community Member

Re: Vlans trunking fiber optic connection

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.

Hall of Fame Super Gold

Re: Vlans trunking fiber optic connection

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

Please remember to rate useful posts clicking on the stars below.

Community Member

Vlans trunking fiber optic connection

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?

Hall of Fame Super Gold

Vlans trunking fiber optic connection

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.

Please remember to rate useful posts clocing on the stars below.

1273
Views
0
Helpful
6
Replies
CreatePlease to create content