802.1Q VLAN Tagging on a Cisco Catalyst 3750-E
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technology, networking and IP telephony
802.1Q VLAN Tagging on a Cisco Catalyst 3750-E
by MICHAEL MCNAMARA on JANUARY 29, 2011
In the two previous
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0
posts I covered how to
create multiple VLANs,
trunk those VLANs
between multiple
stackable Avaya
Ethernet Routing
Switches utilizing
Multi-Link Trunking
and how to create
Layer 3 IP interfaces to be used for routing IP packets between those VLANs.
In this post I thought I would expand the network topology of my previous two posts to
include a Cisco Catalyst 3750-E. I’ll specifically cover how to trunk (bridge) multiple VLANs
between a stackable Avaya Ethernet Routing Switch and the Cisco Catalyst 3750-E and how
to configure multiple interfaces in a Link Aggregation Group (LAG) utilizing LACP similar to
Avaya’s proprietary MLT feature.
Avaya Ethernet Routing Switch 4548
enable
config t
Let’s start by making ports 45 and 46 trunk ports which will utilize 802.1Q tagging;
vlan ports 45,46 tagging tagAll
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Let’s add the VLANs we wish to bridge across the trunk ports;
vlan members add 1 45,46
vlan members add 100 45,46
vlan members add 200 45,46
Now we’ll enable LACP on ports 45 and 46 using the same LACP key which will automatically
create the LAG;
interface fastEthernet 45
lacp key 10
lacp mode active
lacp timeout-time short
lacp aggregation enable
exit
interface fastEthernet 46
lacp key 10
lacp mode active
lacp timeout-time short
lacp aggregation enable
exit
Avaya Ethernet Routing Switch 4548 – Show Commands
4548GT-PWR#show lacp port 45,46
Admin Oper
Trunk Partner
Port Priority Lacp
A/I Timeout Key
Key
AggrId Id
Port
Status
---- -------- ------- --- ------- ----- ----- ------ ----- ------- -----45
32768
Active A
Short
10
12298 8224
32
302
Active
46
32768
Active
A
Short
10
12298 8224
32
303
Active
4548GT-PWR#show mac-address-table
Mac Address Table Aging Time: 300
Number of addresses: 26
MAC Address
Vid Source
----------------- ---- -------
MAC Address
Vid Source
----------------- ---- -------
00-02-B3-CB-77-A2
00-0C-29-64-33-F9
1 Port:19
1 Port:19
00-04-61-9E-46-7E
00-0C-29-A5-CB-54
1 Port:21
1 Port:19
00-0F-20-95-38-D5
00-1C-11-6B-DC-6B
1 Port:11
1 Port: 1
00-18-01-EA-F4-45
00-1C-11-6D-15-27
1 Port: 1
1 Port: 1
00-1C-11-6D-15-DC
00-1E-7E-7C-2C-40
1 Port: 1
1
00-1E-7E-7C-2C-00
00-1F-0A-CE-BC-01
1
1 Trunk:1
00-1F-0A-CE-BC-40
00-23-EE-96-AA-21
1 Trunk:1
1 Port: 1
00-1F-D0-D0-BE-2D
00-24-B5-F6-94-02
1 Port:17
1 Trunk:1
00-64-40-CF-4D-AD
00-64-40-CF-4D-C0
1 Trunk:32
1 Trunk:32
00-64-40-CF-4D-AE
00-0A-E4-76-9C-C8
1 Trunk:32
2 Port:44
00-24-DC-DF-0D-08
2 Port:43
00-A0-F8-5E-CE-BC
2 Port:39
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00-1F-0A-CE-BC-41
00-64-40-CF-4D-AD
100 Trunk:1
100 Trunk:32
00-24-7F-99-84-70
00-1E-CA-F3-1D-B4
100 Port:25
200 Port:26
00-1F-0A-CE-BC-43
200 Trunk:1
00-64-40-CF-4D-AD
200 Trunk:32
4548GT-PWR#show mlt
Id Name
Members
Bpdu
Mode
Status
Type
-- ---------------- ---------------------- ------ -------------- ------- -----1 MLT_to_ERS5520
47-48
All
Basic
Enabled Trunk
2
3
Trunk #2
Trunk #3
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
4
5
Trunk #4
Trunk #5
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
6
7
Trunk #6
Trunk #7
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
8
9
Trunk #8
Trunk #9
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
10 Trunk #10
11 Trunk #11
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
12 Trunk #12
13 Trunk #13
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
14 Trunk #14
15 Trunk #15
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
16 Trunk #16
17 Trunk #17
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
18 Trunk #18
19 Trunk #19
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
20 Trunk #20
21 Trunk #21
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
22 Trunk #22
23 Trunk #23
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
24 Trunk #24
25 Trunk #25
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
26 Trunk #26
27 Trunk #27
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
28 Trunk #28
29 Trunk #29
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
30 Trunk #30
31 Trunk #31
NONE
NONE
All
All
Basic
Basic
Disabled
Disabled
32 Trunk #32
45-46
Single DynLag/Basic
Enabled Trunk
You might be looking at the output above and asking yourself what’s “Trunk 32”? Let me
provide some quick background. You can have a total of 32 MLT/LAG trunks on a stackable
Avaya Ethernet Routing Switch. When you create LACP trunks the switch automatically
creates a LAG in the MLT table dynamically from the bottom up. While in the previous post I
created “Trunk 1” by trunking ports 47 and 48 together (see above), in this post I’ve created
an LACP trunk on ports 45 and 46 which will be reported it the switch as “Trunk 32”. You can
also see it in the MAC/FDB table above.
Cisco Catalyst 3750-E
enable
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config t
Let’s give the switch an IP address in VLAN 1 for management;
vlan 1
ip address 192.168.1.25 255.255.255.0
no shut
exit
Let’s create VLAN 100 and VLAN 200 on the switch;
vlan 100
name "192-168-100-0/24"
exit
vlan 200
name "192-168-200-0/24"
exit
Let’s add the appropriate edge ports to each VLAN;
interface range gigabitEthernet 1/0/1-12
switchport access vlan 1
exit
interface range gigabitEthernet 1/0/13-24
switchport access vlan 100
exit
interface range gigabitEthernet 1/0/24-36
switchport access vlan 200
exit
Let’s configure ports 45 and 46 as trunk ports and bond them together in channel-group
utilizing LACP;
interface gigabitEthernet 1/0/45
switchport trunk encapsulation dot1q
switchport mode trunk
channel-protocol lacp
channel-group 1 mode active
interface gigabitEthernet 1/0/46
switchport trunk encapsulation dot1q
switchport mode trunk
channel-protocol lacp
channel-group 1 mode active
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Cisco Catalyst 3750-E – Show Commands
SW-3750-E#show lacp neighbor
Flags: S - Device is requesting Slow LACPDUs
F - Device is requesting Fast LACPDUs
A - Device is in Active mode
P - Device is in Passive mode
Channel group 1 neighbors
Partner's information:
LACP port
Admin
Oper
Port
Port
Port
Flags
Priority
Dev ID
Age
key
Key
Gi1/0/45
FA
32768
001e.7e7c.2c00
16s
0x0
0x300A 0x2D
Number
State
0x3F
Gi1/0/46
FA
32768
001e.7e7c.2c00
27s
0x0
0x300A 0x2E
0x3F
Switch#show mac address-table
Mac Address Table
------------------------------------------Vlan
----
Mac Address
-----------
Type
--------
Ports
-----
All
All
0100.0ccc.cccc
0100.0ccc.cccd
STATIC
STATIC
CPU
CPU
All
All
0180.c200.0000
0180.c200.0001
STATIC
STATIC
CPU
CPU
All
All
0180.c200.0002
0180.c200.0003
STATIC
STATIC
CPU
CPU
All
All
0180.c200.0004
0180.c200.0005
STATIC
STATIC
CPU
CPU
All
All
0180.c200.0006
0180.c200.0007
STATIC
STATIC
CPU
CPU
All
All
0180.c200.0008
0180.c200.0009
STATIC
STATIC
CPU
CPU
All
All
0180.c200.000a
0180.c200.000b
STATIC
STATIC
CPU
CPU
All
All
0180.c200.000c
0180.c200.000d
STATIC
STATIC
CPU
CPU
All
All
0180.c200.000e
0180.c200.000f
STATIC
STATIC
CPU
CPU
All
All
0180.c200.0010
ffff.ffff.ffff
STATIC
STATIC
CPU
CPU
1
1
0004.619e.467e
000c.2964.33f9
DYNAMIC
DYNAMIC
Po1
Po1
1
1
000c.29a5.cb54
000f.2095.38d5
DYNAMIC
DYNAMIC
Po1
Po1
1
1
0018.01ea.f445
001c.116b.dc6b
DYNAMIC
DYNAMIC
Po1
Po1
1
001c.116d.1527
DYNAMIC
Po1
1
001c.116d.15dc
DYNAMIC
Po1
1
1
001e.7e7c.2c01
001e.7e7c.2c2d
DYNAMIC
DYNAMIC
Po1
Po1
1
1
001e.7e7c.2c2e
001f.d0d0.be2d
DYNAMIC
DYNAMIC
Po1
Po1
1
1
0023.ee96.aa21
00a0.f85e.cebd
DYNAMIC
DYNAMIC
Po1
Po1
100
0024.7f99.84e9
DYNAMIC
Po1
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200
200
0008.02e4.890a
001e.caf3.1db4
DYNAMIC
DYNAMIC
https://blog.michaelfmcnamara.com/2011/01/802-1q-vlan-tagging-on-a-ci...
Gi1/0/25
Po1
Total Mac Addresses for this criterion: 37
You might be asking why didn’t I assign the VLANs to the trunk ports on the Cisco Catalyst
3750-E… well with Cisco switches a trunk port is by default a member of all the VLANs that
exist on the switch. So you don’t need to specifically add a VLAN to a trunk port, however,
you can override the default behavior by telling the switch to only carry specific VLANs on a
specific trunk port – this is called VLAN pruning.
Please feel free to point out any inconsistencies or errors I might have made.
Cheers!
You might also want to read these other posts...
1. 802.1Q VLAN Tagging on an Ethernet Routing Switch
2. Short Story – switchport trunk allowed vlan
3. LACP Configuration Examples (Part 1)
LACP Configuration Examples (Part 4)
November 25, 2013, 5:20 pm
[…] In the past I’ve demonstrated how to connect an Avaya Ethernet Routing Switch 8600 to an
Avaya Ethernet Switch 470, an Avaya Ethernet Routing Switch 8600 Cluster to an Avaya Ethernet
Switch 470 via SMLT, an Avaya Ethernet Routing Switch 8600 Cluster to a HP GbE2c(Blade
Technologies) via SMLT, and even an Avaya Ethernet Routing Switch 5520 to Cisco Catalyst 3750E.
[…]
Comments on this entry are closed.
JT
January 30, 2011, 9:54 am
Also important is that Cisco implements STP in a per-VLAN fashion rather than CST.
If the Avaya acts the same as it’s Nortel predecessors it will take the link down if there is a
loop in VLAN 1 regardless if any other VLANs are loop-free. This makes life difficult when you
want some VLANs to act as point-to-point links for routing purposes and others for more
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expansive topologies that will likely have loops.
LINK
Michael McNamara
January 30, 2011, 1:23 pm
Hi JT,
The default behavior/configuration of the Nortel/Avaya Ethernet Routing Switch has
legacy Spanning Tree enabled where you have a single CIST, as you referred to above.
You can enable RSTP or MSTP with the following command;
4548GT-PWR(config)#spanning-tree op-mode ?
mstp
802.1s Multi Spanning Tree Protocol
rstp
802.1w Rapid Spanning Tree Protocol (single group/instance)
stpg
Nortel Multi Spanning Tree Protocol
Although JT has a great point in that you certainly need to consider Spanning Tree in
your design.
Thanks for the comment!
LINK
dpsguard
May 1, 2013, 9:18 pm
Hi Michael,
Great information on your site. This is first time I visited your site and appreciate
knowledge sharing. I have difficulty to get to the end of the page, so I took liberty to
post here.
I have confusion here after reading this post (no prior Nortel experience but sufficient
Cisco), the Cisco switch has management IP in VLAN1 and this is native / untagged
by default on the trunk / uplink to the Nortel 4500 switch, which has all vlans tagged.
How does the untagged management frames go thru them? When you say tagall,
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does this imply that default vlan 1 is always untagged (unless default vlan id is
changed and then that becomes untagged on 802.1q uplinks in Nortel) or do we
really need something like vlan 45-46 tagging untagpvidonly?
I found your site while doing a Google search, wherein I am trying to set up a ring on
4 sites in campus over fiber / radio using 4500 switches each thus connecting on east
and west side to the other site /4500. Actually all sites sites are connected via 3
intervening fiber circuits and there was a fiber issues a month ago, so we thought to
put a radio between site 1 and site 4 to close the loop (radio is transparent IP wireless
bridge and passes vlan tags and needs its management vlan (which is vlan 1 as was
set up by someone) to be untagged.
So when we tried to connect the radio bridge, assuming, the STP will kick in and
block one port somewhere on the uplinks and all will be good, but it does not work as
it results into a loop.
Regular STP is enabled on all 4500 switches, and I have set up PVID of 1 on these
two uplinks going to the fiber / radio loop and then also tried used tagging
untagpvidonly on these, but then reverted back to tagging tagall.
I will also like to assign a higher port cost to the port that goes to the Radio at say site
4, so that STP will normally block that port and keep other 1 Gig fiber links
forwarding. But I cannot find how do I assign STP port cost of say 40 (default STP
legacy 1 Gig port cost is 4) to the corresponding uplink port on 4500 switch. There is
a config line with port cost 1 priority 80, not sure what this port cost 1 mean here, on
all switches, even with legacy dot1d costing, it should be 4).
So something like that I have in the main 4500 switches at each location. Any help will
be greatly appreciated.
vlan 1 name “Ring”
vlan 2 users
vlan 3 servers
vlan port 45-46 pvid 1
vlan port 45-46 tagging tagall filter-untagged-frame disable filter-unregistered-frames
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enable priority 0
(this is where I tried replacing tagall with untagpvidonly) and I assume tagall in
combination with pvid of 1 on these ports makes the uplinks to have native vlan 1 for
untagged frames).
vlan mgmt 3
spanning-tree cost-calc-mode dot1d
spanning-tree port-mode normal
spanning-tree stp 1 priority 8000
spanning-tree stp 1 hello-time 2
spanning-tree stp 1 forward-time 15 max-age 20
spanning-tree stp 1 tagged-bpdu disable tagged-bpdu-vid 4001
spanning-tree stp 1 multicast-address 01:80:c2:00:00:00
spanning-tree stp 1 add-vlan 1
spanning-tree stp 1 add-vlan 2
spanning-tree stp 1 add-vlan 3
spanning-tree port 45-46 learning normal
spanning-tree port 45-46 cost 1 priority 80
spanning-tree bpdu-filtering port 45-46 timeout 120
no spanning-tree bpdu-filtering port 45-46 enable
Thanks
LINK
Michael McNamara
May 8, 2013, 10:51 pm
Hi dpsguard,
Unfortunately there’s an issue with the theme I’m using on my blog that is “hiding”
replies on some of the more commented posts. I really need to address that
problem since I value the comments and feedback that everyone provides.
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Your post is exceptionally long and detailed, so don’t think ill of me for not
replying in such length. I would encourage you to post over in the discussion
forums where myself and others will try and bring you up to speed.
You might also want to check out this post;
http://blog.michaelfmcnamara.com/2012/02/untagall-vs-tagall-on-avaya-ethernetrouting-switches/
In short with a port set to UnTagAll, there should only be a single VLAN assigned
to that port and all frames are untagged. With a port set to UnTagPvidOnly, there
can be multiple VLANs assigned with the “Default PVID” being untagged the
remaining VLANs being tagged – this is equivalent to Cisco trunk behavior.
Unfortunately I don’t have the time right now to reply with any more detail.
Cheers!
LINK
Rob
February 6, 2011, 7:19 am
Hi Michael,
Great blog! Some really useful tips, good of you to give your time to it.
Is it possible to split a Cisco switch between an IST pair of say ERS5530s? Would the ERSs
need a LAG on each rather than SMLT/MLT?
Thanks,
Rob
LINK
Michael McNamara
February 6, 2011, 11:55 am
Hi Rob,
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I believe the ERS 5000 series supports utilizing 802.3ad (LACP) over SMLT.. I know the
ERS 8600 can I’m just not 100% sure about the lower models.
Cheers!
LINK
Parvesh
April 13, 2011, 7:40 am
HI Can u pls tell me I have one Norte 4558GT switch and one cisco 2960.
I want to connect Cisco 2960 switch with Nortel 4558GT. pls
tell me what config should i apply on both end of switch for
properly communication in between both switch.
LINK
Michael McNamara
April 13, 2011, 2:48 pm
Hi Parvesh,
You can use the same commands above that I provided for ERS 5520 for the ERS 4500.
Good Luck!
LINK
Scott
August 24, 2011, 2:22 pm
Love your site so much!
I have seen an issue with this type of configuration. Here’s the scenario:
Cisco switchconfigured with a 2 member EtherChannel to a Nortel Switch
Members/PortChannel is an access port (VLAN 1)
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Default PVST configuration is used
EtherChannel mode set to on
Nortel is configured with a 2 member MLT to the Cisco Switch
Default Nortel STG is used
In this configuration, the Cisco EtherChannel will be ErrDisabled as a spanning tree loop is
detected. I just ran into this situation. Here’s my question:
I would rather not disable spanning tree, and notice that there is an option in the DM called
NtStgEnable. It is described as turning on/off nortel STG mode. It is using Nortel mode by
default.
Will disabling this option correct this behavior? I can’t find any conclusive documentation on
it..
LINK
Michael McNamara
August 26, 2011, 10:05 am
Hi Scott,
You should review this article; http://blog.michaelfmcnamara.com/2011/06/avayasmultilink-trunk-and-spanning-tree-protocol/
You need to configure the Avaya/Nortel switch for MSTP (the default is STP) and then
enable “mlt 1 bpdu all-ports” on the specific MLT.
Good Luck!
LINK
kcp
April 24, 2013, 7:56 am
Hi Michael,
Great post. I had an issue in a similar setup posted here, and customer created a
loop between cisco and avaya switch through avaya phone connected to avaya 4826
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switch. Cisco 4507 switch is on etherchannel, with pvst. Avaya never trigger bpdu
filter in such scenario and cisco etherchannel ports go down, can you help with expert
opinion.thanks.
LINK
Michael McNamara
April 24, 2013, 6:38 pm
I would verify that Spanning Tree (FastStart) was enabled along with
BPDU filtering. I’ve seen it done dozens of times here and it always kicks off the
port. There was a very early release of software/firmware for the i2002/i2004 IP
phones which had an issue when both ports were connected to the switch, I
believe they were filtering the BPDU frames which allowed the loop.
Ultimately you’d need to simulate in a testlab to see the real story.
Cheers!
LINK
Mark Nelson
December 12, 2011, 6:09 pm
I haven’t done much with VLAN’ing, but where in this article did it tell us how to
enable VLAN tagging on a Cisco 3750 stackwise switch? Thanks!
Mark
LINK
Michael McNamara
December 12, 2011, 6:15 pm
Hi Mark,
You only need to enable dot1q on the physical interface to enable VLAN tagging;
interface gigabitEthernet 1/0/45
switchport trunk encapsulation dot1q
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Cheers!
LINK
Mark Nelson
December 12, 2011, 6:22 pm
Thanks for the quick reply! If you have a sec, maybe you can help me with a
problem. Here is the explanation:
I am trying to setup a seperate vlan to go to a seperate WAP in my network, so I can provide
guest internet access without my production network being visible. I’ve set it up, but it is not
working. I created a sub-interface for the new vlan (VLAN 12) on my ASA5510 firewall. The
new VLAN is 172.72.72.0/28, for example. I gave it an ip on that sub-interface of 172.72.72.1.
Then, I connected the WAP and configured it to be on that VLAN and subnet. I found out the
WAP isn’t DHCP (server) capable, so I set the ASA to act as the DHCP server for that VLAN. I
connected a laptop wirelessly and it received an ip address from my normal inside DHCP
server…??? How did it do that??? Also, I could get out to the internet and see the rest of my
network. So, then I set the port on the switch that the WAP is connected to, to be on that
VLAN only and now, my laptop won’t get an ip at all. So, just to see if the rest of the
configuration is good, I statically assigned an ip address for that subnet on my laptop and I
could see the WAP, but not the firewall. I tried pinging the sub-interface on the firewall and
couldn’t. Also, I can ping the WAP, but I can’t actually access it via the web interface. But, if I
leave that 172.72.72.x static address on the laptop and connect to my production wireless, I
can get to the web interface of the WAP, but no where else. I’m not sure where I went wrong
here. Any thoughts?
Thanks!!!
Mark
LINK
Michael McNamara
December 12, 2011, 8:06 pm
Hi Mark,
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Your question isn’t really on topic but I’m still happy to help. Post your problem over on
the discussion forums and I’ll be sure to respond (along with quite a few other people I
suspect).
Cheers!
LINK
Mark Nelson
December 13, 2011, 11:13 am
I posted that in the Cisco Routers and Switches forum. Thanks again for you help!
Mark
LINK
Michael McNamara
December 15, 2011, 7:08 pm
You’re welcome Mark!
LINK
Cesar
February 14, 2012, 9:44 pm
Hello Michael,
This configuration works with Server too?
Regards,
LINK
Michael McNamara
February 15, 2012, 12:38 pm
Hi Cesar,
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Assuming the server supports LACP it should certainly work.
Cheers!
LINK
Rajesh Bisht
April 17, 2013, 7:11 am
Hi Michael,
I have tried configuring LACP between Avaya 4548GT & Cisco 2960 as per the instructions in
your blog http://blog.michaelfmcnamara.com/2011/01/802-1q-vlan-tagging-on-a-ciscocatalyst-3750-e/, but one of my etherchannel port on cisco switch always remains in
suspended mode. could you please help me in sorting out the same.
Regards
Rajesh Bisht
LINK
Michael McNamara
April 18, 2013, 3:50 pm
Hi Rajesh,
You need to determine why the port is being suspended. Are you running Spanning
Tree? What’s in the log files?
Good Luck!
LINK
Rajesh Bisht
April 19, 2013, 3:42 am
Hi Michael,
there is nothing on the log which suggest anything about this problem. I t just says
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that the port is up. I think Spannning-tree is by default up on Cisco switches & I have
not disabled it manually.
On the Avaya switch it is enabled on the port where this trunk cable is connected.
Regards
Rajesh
LINK
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bekzod
https://blog.michaelfmcnamara.com/2011/01/802-1q-vlan-tagging-on-a-ci...
April 18, 2013, 12:47 pm
HI, very useful post . But if I need to aggregate links from 3 ERS 4550 to 1 HP
switch :
1 Do i need to setup DMLT and setup LACP ? I tried to setup MLT but it’s don’t want to work
with LACP on ERS4550 ..
or LACP will be enough for that 3to1 setup ?
LINK
Michael McNamara
April 18, 2013, 3:48 pm
Hi Bekzod,
Any comments made to this blog by first time posters are held for moderation. I deleted
your second post.
You didn’t mention if the 3 ERS 4550s were in a stack configuration. You could certainly
follow the steps outlined above to add additional ports to the trunk group. Assuming the
HP switch supports LACP you should have what you need concerning the Avaya switch
below.
Good Luck!
LINK
bekzod
April 19, 2013, 10:26 am
Thank you . So if I have a stack of ERS 4550 and 1 GB link from each of the 3 to 1
HP switch (support LACP) then I don’t need to setup MLT and LACP will be enough . Correct
?
I like how you help and because of we are working mostly with Avaya I will often bother you ;)
.
Best Regards .
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LINK
Michael McNamara
April 24, 2013, 6:41 pm
When you setup LACP it will automagically create an MLT.
Cheers!
LINK
kcp
April 25, 2013, 6:51 am
Hi Michael,
Thanks for swift response. When we configure mstp on both ends( even without creating
instances on it), now it kicks off and either of the switches shut the port. However things does
not work when phone is off, loop is created, and then the phone is booted. Seems during
booting of phone bpdu are not passing through as I can see only LLDP packets in traffic.
Phone is avaya 1000 series. What’s your view on this?
LINK
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