WannabeNerd
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QoS /VLAN's basics using Cisco devices?
I do not know much about QoS and how it works. Our company is growing and we are in phase of implementing Wireless which in turn will support both VoIP and data. Currently we running VoIP in our environment but there are no VLAN's or QoS configured at all. Everything runs on default VLAN. In order to plan and design our new netowork i have few questions:-
// Lets say we have a cisco 2960 layer 2 switches spread all over and a Cisco ___ layer 3 switch as our core switch//
1. QoS:- Does the priority take place at the core layer 3 switch or the layer 2. Say if a packet enters a 2960 switch will it first go to the layer 3 switch and then gets prirotised or does it gets pririotised as soon as it enters the 2960. And how does this happen? (please do not refer to cisco pages because to understand QoS there is too hard for me)
2. QoS:- If 2960's can do QoS on there own why will we need to get a layer 3 switch?
3. QoS:- Prioritisation take place on what basis ? Is it protocols or ports ?
4. QoS:- If i enable "auto qos voip" on the ports connected to the phone and "auto qos trunk" on my trunk links, does it mean my QoS is running in full and i dont need to fiddle with anything else?
5.QoS:- "auto qos discovery" which switches support it and please please suggest a layer 3 switch which will suite my environment.
6.VLAN's:- Finally, will it be worth to put the VLAN's in place even if you are running the QoS. I know they are totally different concepts but ours is not a very big environment say about 100 computers and about 50 phones.
I know too many question's :-) ,any answers will be highly appreciated. Thanks!!
// Lets say we have a cisco 2960 layer 2 switches spread all over and a Cisco ___ layer 3 switch as our core switch//
1. QoS:- Does the priority take place at the core layer 3 switch or the layer 2. Say if a packet enters a 2960 switch will it first go to the layer 3 switch and then gets prirotised or does it gets pririotised as soon as it enters the 2960. And how does this happen? (please do not refer to cisco pages because to understand QoS there is too hard for me)
2. QoS:- If 2960's can do QoS on there own why will we need to get a layer 3 switch?
3. QoS:- Prioritisation take place on what basis ? Is it protocols or ports ?
4. QoS:- If i enable "auto qos voip" on the ports connected to the phone and "auto qos trunk" on my trunk links, does it mean my QoS is running in full and i dont need to fiddle with anything else?
5.QoS:- "auto qos discovery" which switches support it and please please suggest a layer 3 switch which will suite my environment.
6.VLAN's:- Finally, will it be worth to put the VLAN's in place even if you are running the QoS. I know they are totally different concepts but ours is not a very big environment say about 100 computers and about 50 phones.
I know too many question's :-) ,any answers will be highly appreciated. Thanks!!
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ASKER
Thanks decoleur!!
So what you are suggesting is enable auto qos on switchports and segement my traffic using Vlan's + not worry about implementing QoS. Right?
Can you please suggest which layer 3 switch i should get because i will still have to perform inter vlan switching. I also want it to have NBAR on it because it will give me auto qos discovery option.
So what you are suggesting is enable auto qos on switchports and segement my traffic using Vlan's + not worry about implementing QoS. Right?
Can you please suggest which layer 3 switch i should get because i will still have to perform inter vlan switching. I also want it to have NBAR on it because it will give me auto qos discovery option.
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ASKER
Cheers!
I know this is not the part of my actual question but i would be really grateful if you can guide me here.
Consider. L2 switch connected to L3 switch with trunking working on it.
On a L2 switch lets say i have 3 vlans
Default vlan 192.168.1.1/24 ; port 0/1 assigned.(Management)
vlan 10: 10.0.10.1/24 ; ports fa 0/2 - 0/6 assigned to it
vlan 20; 10.0.20.1/24; ports fa 0/7 - 0/11 assigned to it
and port 0/12 - Set up as the trunk port
On the layer 3 switch i want to set up routes in such a way that 10.0.10.x is able to talk to 10.0.20.x .
On L3 swtich for the interface vlan 10 i assign ip 10.0.10.10/24 and interface vlan 20 = 10.0.20.10/24 and set up a route between them.
Question:-
1. What default gateway i am supposed to set up on my layer 2 swtich. Will it be 10.0.20.10 or 10.0.20.10 ? Because you can only set up one default gateway. Right? My guess is either one of them. Does it make any difference?
2.If i ping from a device on vlan 10 to device on vlan 20. There is a broadcast sent to all ports connected that are on vlan 10 and the trunk port and nothing on vlan 20. When it reaches L3 it then routes it to the device on vlan 20.But is it a unicast or broadcast.?
i will highly appreciate if you can clear it up for me please!!!
I know this is not the part of my actual question but i would be really grateful if you can guide me here.
Consider. L2 switch connected to L3 switch with trunking working on it.
On a L2 switch lets say i have 3 vlans
Default vlan 192.168.1.1/24 ; port 0/1 assigned.(Management)
vlan 10: 10.0.10.1/24 ; ports fa 0/2 - 0/6 assigned to it
vlan 20; 10.0.20.1/24; ports fa 0/7 - 0/11 assigned to it
and port 0/12 - Set up as the trunk port
On the layer 3 switch i want to set up routes in such a way that 10.0.10.x is able to talk to 10.0.20.x .
On L3 swtich for the interface vlan 10 i assign ip 10.0.10.10/24 and interface vlan 20 = 10.0.20.10/24 and set up a route between them.
Question:-
1. What default gateway i am supposed to set up on my layer 2 swtich. Will it be 10.0.20.10 or 10.0.20.10 ? Because you can only set up one default gateway. Right? My guess is either one of them. Does it make any difference?
2.If i ping from a device on vlan 10 to device on vlan 20. There is a broadcast sent to all ports connected that are on vlan 10 and the trunk port and nothing on vlan 20. When it reaches L3 it then routes it to the device on vlan 20.But is it a unicast or broadcast.?
i will highly appreciate if you can clear it up for me please!!!
1 the default route should correspond with the subnet that the managment interface on the switch is on. if it ip is on vlan 10 then its gateway should be the vlan 10 layer3 interface.
2. not quote sure but i think the layer3 interface will do a proxy arp and respond with the mac address of the target on the other vlan if it knows what it is.
2. not quote sure but i think the layer3 interface will do a proxy arp and respond with the mac address of the target on the other vlan if it knows what it is.
ASKER
Q1.If you read the question i have desribed the scenario as well. Packet is entering a layer 2 switch and then we have a layer 3 switch as our gateway. So where will it gets prioritised?
Q3. is it based on protocols or ports.?
Q5. "auto qos discovery" command which switches support them and please suggest a layer 3 switch for my environment.????
If you can clear my conception about question number 1 i guess i will understand most of it (hopefully) :-(