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Prioritize Voice Vlan over Data Vlan

hi i would like to prioritize the voice vlan (id 101) over data vlans between 2 cisco routers.
The routers are connected by Metro Ethernet.
Please assist me with step by step procedure.
i have attached the relevant configs for both Routers.
thank you
ROUTER-1-and-ROUTER-2-Configurat.rtf

ASKER CERTIFIED SOLUTION

rauenpc

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icdl101

ASKER

so without nbar it would simply be

int vlan 101
service-policy input MARK-TRAFFIC

rauenpc

It can depend on the model and code version. Without NBAR, matching on protocol doesn't work so you would have to match based on IP address or just blindly set dscp. What model and IOS version are you running?

icdl101

ASKER

the router does support nbar. i thought it would possibly consume too much resources in turning on nbar, hence i thought of avoiding nbar.

Router model is Cisco 892
Cisco IOS Version 15.0(1)
ROM: System Bootstrap, Version 12.4(22r)

icdl101

ASKER

Cisco 892 (MPC8300) processor (revision 1.0) with 498688K/25600K bytes of memory.
Processor board ID FGL160924XP

9 FastEthernet interfaces
1 Gigabit Ethernet interface
1 ISDN Basic Rate interface
1 Virtual Private Network (VPN) Module
256K bytes of non-volatile configuration memory.
250880K bytes of ATA CompactFlash (Read/Write)

rauenpc

I would think that nbar is the better choice over a blind acl that marks traffic. If I were you, I would give it a shot first. Try to create a baseline for performance in terms of total throughput, latency, end user experience, etc. Then throw it on there and see what happens. I know that sounds like a dicey guess-and-check, but it is hard to know how the 890 series devices will handle the traffic. If it causes problems, it isn't difficult to remove and then you can go back to the drawing board to get the less cpu intensive QoS configured.

icdl101

ASKER

i will try the settings out and hopefully the router behaves well.

just one more query, by enabling the nbar on
" int vlan 101
ip nbar protocol-discovery "
does that mean that nbar will only be inspecting traffic on interface vlan 101 and no other vlan interfaces

thanks

rauenpc

Correct. It will only classify traffic on that interface. Don't confuse classification with inspection as one essentially marks/categorizes traffic and the other is usually related to firewall rules.