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Multiple Static Routes

Posted on 2014-10-28
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Last Modified: 2014-11-02
I am trying to implement VoIP with SIP trunks on my network. I have a campus environment with three campuses and one centralized CORE Switch (Cisco 4510) in the data center at the main campus.

On the Cisco 4510 I have a voice vlan and vlan interface for the voice network at each campus. At the remote campuses I have Cisco 3750 as the distribution switch and Cisco 3560 as the access layer switch. The Cisco 3750 has a trunk to the Cisco 4510 allowing ALL vlans across an I have another trunk from the Cisco 3750 to the Cisco 3560 allowing ALL vlans.

The problem I am facing is there are SIP trunks at each campus that connects to the Providers MPLS network. Each campus is to send voice traffic to their local SIP trunk, not across the WAN. On the Cisco 4510, there is a static route to the providers network (10.250.0.0). Since ALL the voice vlans and vlan interfaces reside on the Cisco 4510, how do I send the voice traffic across the local SIP trunk at each campus?

Can I have multiple static routes to the providers network?
Do I have to create the vlans and vlan interfaces on the Cisco 3750 and 3560 at each campus?
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Question by:rweaver313
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Don Johnston earned 2000 total points
ID: 40409821
Sounds like you need to implement Policy Based Routing (PBR).

You can specify a policy (traffic sourced from a particular IP address or using a specific protocol/port) and then define how that traffic is routed.
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by:rweaver313
ID: 40409882
Thanks for the quick response. I am not familiar with setting up Policy Based Routing so excuse me if I'm somewhat confused. Can you provide an example. Here is what I need to accomplish:

Campus A
static route 10.250.0.0 to 10.7.24.9

Campus B
static route 10.250.0.0 to 10.7.80.9

Do I setup the PBR on the Cisco 4510?
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by:Don Johnston
ID: 40409891
Kind of hard to say without a better understanding of the topology.

But here's the idea:

Create an ACL to define the traffic
access-list 1 permit 192.168.1.0  0.0.0.255

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Then create a route-map to define what happens to traffic that matches the ACL
route-map alpha permit 10
 match ip address 1
 set ip next-hop <1.2.3.4>

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Finally, apply this to the interface that will be receiving the traffic that you want to route.
interface VLAN 8
 ip policy route-map alpha

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The result is that any traffic arriving (inbound) on the VLAN 8 interface is subject to the route map.  If the traffic is coming from the 192.168.1.0/24 network, it will be forwarded to the next hop address of 1.2.3.4 regardless of what's in the routing table.

If the traffic isn't coming from the 192.168.1.0 network, then it will be forwarded based on the routing table.
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Author Comment

by:rweaver313
ID: 40409914
I think I get it, i will give it a try.

If I were to create a static route from the providers network 10.250.0.0 to my entire voice network (10.7.0.0), would that work as well? Would this allow any ip on the voice network to access their network and vice versa?

Example: ip route 10.7.0.0/24 10.250.0.0
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Expert Comment

by:Don Johnston
ID: 40409944
That will direct any traffic to the 10.7.0.0/24 network to 10.250.0.0.
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