Ethernet Switches & Routers

Video: Configuring VLAN Topology Groups

by DennisMSmith on ‎06-20-2016 07:48 AM - edited on ‎03-20-2017 09:22 AM by Community Manager (1,414 Views)

This video will explain how to configure a VLAN topology group on Brocade campus switches.



Video transcript:


0:00 – Hello and welcome to the Brocade campus feature explainer series I'm Terry

0:03 – Henry this time around we're going to talk about how to configure topology

0:07 – groups so the purpose of a topology group is if we have many vlans say a

0:18 – hundred two hundred thousand vlans we don't necessarily want to run a layer 2

0:24 – protection mechanism on all of those vlans so for example we don't

0:30 – necessarily want to run a thousand spanning tree instances or a thousand

0:34 – Rapids spanning tree instances or metro ring instances etc so what we want to do

0:40 – is we want to build a group and we want to run that the layer 2 loop avoidance

0:47 – mechanism only on a master of vlan and then everyone else is going to

0:52 – follow

0:52 – now obviously this is only going to work if the vast majority of your vlans use

0:58 – the same ports right 44 up links or tagged ports so let's build a group of

1:07 – vlans and then we'll see what happens so we're going to config t here I’m going

1:12 – to VLAN 100

1:14 – 150 for example and then we will tag Ethernet 1/2/1 and Ethernet 1/2/3

1:26 – ok so I haven't just built 50 vlans they all have the same port tagged right

1:34 – and so and I’m running router code so in router code spanning tree is disabled by

1:41 – default it is enabled by default on switch code but router code is disabled

1:46 – so I don't have any layer to loop avoidance mechanism here by default on

1:50 – these 50 vlans I've just created so I want to turn on

1:54 – in this case I'm going to run rapid spanning tree so normally I would have

1:58 – to go to each VLAN and configure rapid spanning tree because I’m going to put

2:02 – these in a topology group

2:03 – I'm actually just gonna job turn it on a single VLAN and then create that

2:09 – one is the master so we're going to go to VLAN 100 here

2:14 – just as an example and we'll do a span

2:19 – oops span 802-1w to turn on rapid spanning tree and then we'll make

2:28 – ourselves the root bridge so we're going to do a priority 0 on that as well so

2:34 – that's good

2:35 – and then and so I have spanning tree turned on this single VLAN and nothing else

2:42 – so what I'm going to do now is create a topology group so the command is

2:48 – topology - group you give it a number so it could be anything from 1 to 2 55 I believe but

2:55 – we'll start with 1 and then we're going to assign a member

2:59 – sorry master vlan first so our master VLAN is is the VLAN that we just group

3:05 – added rapid spanning tree - so 100 in this case

3:09 – okay and then we assign our member vlans so its

3:15 – member - VLAN is one way to do it and then we will assign our vlans 101

3:21 – to, and you can do them one at a time obviously but we're going to do to 150

3:30 – so easy as that so if I do a show topology group now you'll see our

3:40 – topology group 1

3:41 – our master vlan is 100 our member VLAN is 101 to 150 right so there's

3:47 – 50 vlans in the group our common control ports l2 protocol so our common control

3:55 – ports are 1/2/1 and 1/2/3 that are running rapid spanning tree and

3:59 – we don't have any per VLAN free ports so what this means is its ports in other

4:04 – vlans that are not in that master vlan right so if I had other ports

4:11 – tag and in those other 49 vlans that were not in that master vlan then

4:16 – they wouldn't necessarily be running that control protocol so they're

4:19 – considered free vlans the other thing we can do is we can create vlan groups

4:23 – so would we do that with a VLAN group commands of vlan group command and give it a

4:29 – number, so that’s all one command

4:33 – so VLAN and we're going to go 151 to 161 will put ten vlans in this

4:41 – group right

4:43 – tag e 1/2/1 e 1/2/3 and just out of interest we're going to do e 1/1/1

4:55 – ok so we've actually added more vlans to that group then were in the master vlan

5:01 – and so we're going to go back into our topology group and add that vlan

5:05 – group and actually before I do that let me show you that in a show run so

5:10 – there's all my vlans that we created before

5:13 – so those are created as individual vlans even though I created them with one

5:19 – command but here's a VLAN group so vlan group is basically the same

5:22 – thing it's just a group of vlans with exactly the same settings on them

5:28 – so if I go into my topology group so topology

5:33 – - group one right and then

5:37 – so under VLAN here

5:40 – oh sorry under member I should say I have two choices I can add member VLAN

5:47 – which is what I did before to add a group of vlans all at once or I could do

5:52 – member - group and add the vlan group I just created

5:57 – so all I gotta do is add the vlan number the group number that I just created and

6:01 – that adds it as a member so if I do a show topology group again you'll now see

6:09 – that I have

6:12 – view and 100 my master 101 to 150 is members have a member

6:17 – Group one so I now have 61 vlans layer 2 protocol with 802-1w and you'll

6:24 – see that I have all these all these free port's right so Ethernet 1/1/1

6:27 –for vlans 151 to 161 are all considered free ports and that's because

6:33 – those are interfaces in my other vlans actually might be like group in this

6:39 – case that are not part of the master vlan so they're not going to be

6:42 – protected by that layer 2 loop avoidance mechanism so that's what that

6:46 – means

6:48 – anyway so topolgy groups are a good way to configure multiple vlans easily

6:56 – without having to go through and run spanning tree algorithms or rapid

6:59 – spanning tree or MRP or vsrp on all those vlans it's hard on this on the

7:05 – switch cpu if you're trying to run you know 200 or if you're trying to

7:11 – run a thousand the entrances that would be very difficult for the switch to run

7:15 – that reconvergence whereas in this case we're only running a single spanning

7:21 – tree or Rapids pantry instance for all of those vlans for 61 vlans

7:26 – you can obviously have multiple topology groups and have them counter-rotating

7:30 – right have different spanning tree root bridges on different

7:34 – topolgy group devices and so there's lots of things you can do

7:39 – but yet lots of flexibility but it certainly will ease your life if you

7:45 – want to play that anyway thanks for joining

7:48 – appreciate it