topic RE: Avaya ERS4526 Trap: RSTP Topology Change in ExtremeSwitching (VSP/Fabric Engine)

Avaya ERS4526 Trap: RSTP Topology Change

Thuy_Vu — Mon, 28 May 2018 09:13:00 GMT

Hi,

ERS4526 which is access switch, only connect end user and two links to Core Switch. Two links are always up. Switch have logs about "Trap: RSTP Topology Change" when Link Up Trap for Unit/Port.

ERS4526_#show logging sort-reverse unit 1
Type Unit Time Idx Src Message
---- ---- ----------------------------- ---- --- -------
I 1 151:18:00:28 35527 Link Up Trap for Unit/Port:
4 / 22
I 1 151:18:00:26 35526 Link Down Trap for Unit/Port
: 4 / 22
I 1 151:17:58:41 35525 Trap: RSTP Topology Change
I 1 151:17:58:11 35524 Link Up Trap for Unit/Port:
4 / 22
I 1 151:17:58:08 35523 Link Down Trap for Unit/Port
: 4 / 22
I 1 151:17:58:04 35522 Link Up Trap for Unit/Port:
4 / 22
I 1 151:17:58:01 35521 Link Down Trap for Unit/Port
: 4 / 22
I 1 151:17:57:59 35520 Link Up Trap for Unit/Port:
4 / 22
I 1 151:17:57:55 35519 Link Down Trap for Unit/Port
: 4 / 22
I 1 151:17:57:47 35518 Trap: RSTP Topology Change
I 1 151:17:57:16 35517 Link Up Trap for Unit/Port:
3 / 5
I 1 151:17:57:09 35516 Link Down Trap for Unit/Port

I try to enable edge-port and bpdu-filtering on interfaces which connect to end user (4/22, 3/5). But it still appear when Link up Trap, then Trap: RSTP Topology Change.

Question:
1. Why do "Trap: RSTP Topology Change" appear when interface up/down, although interface connect end user?
2. How to disable Trap RSTP Topology Change?

! Base model = Ethernet Routing Switch 4526GTX
! Base Software version = v5.4.0.008
Thanks,

RE: Avaya ERS4526 Trap: RSTP Topology Change

Vali_Ene — Tue, 29 May 2018 21:55:00 GMT

You said you are configuring the end station ports as edge ports. Do those ports appear as edge also at operational level?

RE: Avaya ERS4526 Trap: RSTP Topology Change

Thuy_Vu — Wed, 30 May 2018 08:23:00 GMT

Hi,

I use "spanning-tree rstp port 2/1-23 edge-port true" command. Is it right?
Thanks,

RE: Avaya ERS4526 Trap: RSTP Topology Change

Vali_Ene — Wed, 30 May 2018 15:30:00 GMT

First of all verify that the STP Mode is RSTP (as I understand you need):

4524GT(config-if)#show spanning-tree rstp config
The output should be "Stp Version: Rstp Mode"

Second, verify the operational edge status of one port:

4524GT(config-if)#show spanning-tree rstp port config 1
The output should look like this:
Port Admin Edge Status: True
Port Oper Edge Status: True

The above commands were ran on this system: sysDescr:
Ethernet Routing Switch 4524GT
HW:08 FW:5.3.0.3 SW:v5.6.2.026

Later edit: yes, the command to enable the edge ports looks right (at interface level - interf fast 1-10, enter spanning-tree rstp edge-port true)

RE: Avaya ERS4526 Trap: RSTP Topology Change

Thuy_Vu — Wed, 30 May 2018 15:30:00 GMT

Hi Vali,

Thank you for your support.

This log which I collect:
ERS4526#show logging
Type Unit Time Idx Src Message
---- ---- ----------------------------- ---- --- -------
S 1 00:00:00:00 1 NVR Trap: s5CtrUnitDown
S 1 00:00:00:00 2 NVR Trap: s5CtrUnitDown
S 1 00:00:00:00 3 NVR Trap: s5CtrUnitDown
I 1 00:00:00:01 4 Web server starts service on port 80.
I 1 00:00:00:04 5 #0 Session opened from serial connection, access mode: no security
I 1 00:00:00:05 6 IGMP: Unknown Multicast Filter enabled
I 1 00:00:00:11 7 DISTRIBUTE_DB event sent, unit mask 0x01, appl mask 0x00000000
I 1 00:00:00:14 8 Join event sent, unit mask 0x01, appl mask 0x0000005D 0xB5FFFFFF
I 1 00:00:00:14 9 Ring: B 1/1 - D 2/2 - D 3/3 - D 4/4 - D 5/5 - D 6/6
I 1 00:00:00:44 10 ASCII transfer failed at load on boot, Hostname: , File: . General failure.
I 1 00:00:01:17 11 Warm Start Trap
I 1 00:00:01:17 12 Trap: bsnStackManagerReconfig
I 1 00:00:01:17 13 Trap: entConfigChange
I 1 00:00:01:17 14 Trap: RSTP Topology Change
I 1 00:00:01:17 15 Trap: RSTP New Root: 10:00:84:18:88:24:C6:01
I 1 00:00:01:17 16 Trap: RSTP Topology Change
I 1 00:00:01:17 17 Trap: RSTP Topology Change
I 1 00:00:01:17 18 Trap: RSTP Topology Change
I 1 00:00:01:18 19 Trap: RSTP Topology Change
I 1 00:00:01:19 20 Link Up Trap for Unit/Port: 1 / 2
I 1 00:00:01:20 21 Link Up Trap for Unit/Port: 1 / 8
I 1 00:00:01:21 22 Link Up Trap for Unit/Port: 1 / 13
I 1 00:00:01:22 23 Link Up Trap for Unit/Port: 1 / 14
I 1 00:00:01:22 24 Trap: bsnConfigurationSavedToNvram
I 1 00:00:01:22 25 Link Up Trap for Unit/Port: 1 / 15
I 1 00:00:01:23 26 Link Up Trap for Unit/Port: 1 / 16
I 1 00:00:01:24 27 Link Up Trap for Unit/Port: 1 / 18
I 1 00:00:01:25 28 Link Up Trap for Unit/Port: 1 / 19
I 1 00:00:01:25 29 Link Up Trap for Unit/Port: 1 / 20
I 1 00:00:01:26 30 Link Up Trap for Unit/Port: 1 / 21
I 1 00:00:01:26 31 Link Up Trap for Unit/Port: 1 / 22
I 1 00:00:01:27 32 Link Up Trap for Unit/Port: 1 / 23
I 1 00:00:01:27 33 Link Up Trap for Unit/Port: 1 / 24
I 1 00:00:01:29 34 Link Up Trap for Unit/Port: 2 / 5
I 1 00:00:01:30 35 Trap: RSTP Topology Change
I 1 00:00:01:30 36 Link Up Trap for Unit/Port: 2 / 8
I 1 00:00:01:31 37 Link Up Trap for Unit/Port: 2 / 9
I 1 00:00:01:33 38 Link Up Trap for Unit/Port: 2 / 23
I 1 00:00:01:34 39 Link Up Trap for Unit/Port: 3 / 1
I 1 00:00:01:37 40 Link Up Trap for Unit/Port: 3 / 24
I 1 00:00:01:38 41 Link Up Trap for Unit/Port: 4 / 1
I 1 00:00:01:39 42 Link Up Trap for Unit/Port: 4 / 3
I 1 00:00:01:41 43 Link Up Trap for Unit/Port: 4 / 11
I 1 00:00:01:42 44 Link Up Trap for Unit/Port: 4 / 22
I 1 00:00:01:43 45 Link Up Trap for Unit/Port: 4 / 24
I 1 00:00:01:45 46 Link Up Trap for Unit/Port: 5 / 16
I 1 00:00:01:47 47 Link Up Trap for Unit/Port: 5 / 17
I 1 00:00:01:47 48 Link Up Trap for Unit/Port: 5 / 19
I 1 00:00:01:48 49 Link Up Trap for Unit/Port: 5 / 20
I 1 00:00:01:48 50 Link Up Trap for Unit/Port: 5 / 21
I 1 00:00:01:49 51 Link Up Trap for Unit/Port: 5 / 23
I 1 00:00:01:50 52 Link Up Trap for Unit/Port: 6 / 6
I 1 00:00:02:04 53 Trap: RSTP Topology Change
I 1 00:00:02:10 54 Trap: RSTP Topology Change
I 1 00:00:02:16 55 Trap: RSTP Topology Change
I 1 00:00:02:24 56 Trap: RSTP Topology Change
I 1 00:00:02:24 57 Link Down Trap for Unit/Port: 1 / 19
I 1 00:00:02:27 58 Link Up Trap for Unit/Port: 1 / 19
I 1 00:00:02:34 59 Trap: RSTP Topology Change
I 1 00:00:02:42 60 Link Down Trap for Unit/Port: 1 / 21
I 1 00:00:02:45 61 Link Up Trap for Unit/Port: 1 / 21
I 1 00:01:26:04 212 Trap: RSTP Topology Change
I 1 00:01:26:28 213 Trap: RSTP Topology Change
I 1 00:01:27:02 214 Trap: RSTP Topology Change
I 1 00:01:28:50 215 Trap: RSTP Topology Change
I 1 00:01:29:32 216 Trap: RSTP Topology Change
I 1 00:01:30:05 217 #0 Session opened from serial connection, access mode: no security
I 1 00:01:30:06 218 Trap: RSTP Topology Change
I 1 00:01:31:02 219 Trap: RSTP Topology Change
I 1 00:01:31:33 220 Trap: RSTP Topology Change
I 1 00:01:31:54 221 Trap: RSTP Topology Change
I 1 00:01:32:34 222 Trap: RSTP Topology Change
I 1 00:01:33:08 223 Trap: RSTP Topology Change
I 1 00:01:33:38 224 Trap: RSTP Topology Change
I 1 00:01:34:58 225 Trap: RSTP Topology Change
I 1 00:01:35:23 226 Trap: RSTP Topology Change
I 1 00:01:35:38 227 Trap: RSTP Topology Change
I 1 00:01:35:46 228 Trap: RSTP Topology Change
I 1 00:01:36:12 229 Trap: RSTP Topology Change
I 1 00:01:37:48 230 Trap: RSTP Topology Change
I 1 00:01:38:40 231 Trap: RSTP Topology Change
I 1 00:01:39:14 232 Trap: RSTP Topology Change
I 1 00:01:40:10 233 Trap: RSTP Topology Change
I 1 00:01:41:44 234 Trap: RSTP Topology Change
I 1 00:01:42:18 235 Trap: RSTP Topology Change
I 1 00:01:44:32 236 Trap: RSTP Topology Change
I 1 00:01:45:05 237 #0 Session opened from serial connection, access mode: no security
I 1 00:01:45:14 238 Trap: RSTP Topology Change
I 1 00:01:45:52 239 Trap: RSTP Topology Change
I 1 00:01:46:28 240 Trap: RSTP Topology Change
I 1 00:01:47:41 241 Trap: RSTP Topology Change
I 1 00:01:48:02 242 Trap: RSTP Topology Change
I 1 00:01:48:22 243 Trap: RSTP Topology Change
I 1 00:01:48:56 244 Trap: RSTP Topology Change
I 1 00:01:49:08 245 Trap: RSTP Topology Change
I 1 00:01:49:35 246 Trap: RSTP Topology Change
I 1 00:01:50:46 247 Trap: RSTP Topology Change
I 1 00:01:51:24 248 Trap: RSTP Topology Change
I 1 00:01:51:58 249 Trap: RSTP Topology Change
I 1 00:01:53:11 250 Trap: RSTP Topology Change
I 1 00:01:53:57 251 Trap: RSTP Topology Change
I 1 00:01:54:28 252 Trap: RSTP Topology Change
I 1 00:01:55:00 253 Trap: RSTP Topology Change
I 1 00:01:57:25 254 Trap: RSTP Topology Change
I 1 00:01:57:30 255 Trap: RSTP Topology Change
I 1 00:01:58:04 256 Trap: RSTP Topology Change
I 1 00:01:59:48 257 Trap: RSTP Topology Change
I 1 00:02:00:05 258 #0 Session opened from serial connection, access mode: no security
I 1 00:02:00:34 259 Trap: RSTP Topology Change
I 1 00:02:00:52 260 Trap: RSTP Topology Change
I 1 00:02:01:08 261 Trap: RSTP Topology Change
I 1 00:02:02:14 262 Trap: RSTP Topology Change
I 1 00:02:03:36 263 Trap: RSTP Topology Change
I 1 00:02:04:10 264 Trap: RSTP Topology Change
I 1 00:02:04:42 265 Trap: RSTP Topology Change
I 1 00:02:06:02 266 Trap: RSTP Topology Change
I 1 00:02:06:40 267 Trap: RSTP Topology Change
I 1 00:02:06:50 268 Trap: RSTP Topology Change
I 1 00:02:07:14 269 Trap: RSTP Topology Change
I 1 00:02:08:11 270 Trap: RSTP Topology Change
I 1 00:02:08:23 271 Trap: RSTP Topology Change
ERS4526(config)#int fastEthernet 1/2
ERS4526(config-if)#show spanning-tree rt stp conf
Stp Priority (hex): 8000
Stp Version: Rstp Mode
Bridge Max Age Time: 20 seconds
Bridge Hello Time: 2 seconds
Bridge Forward Delay Time: 15 seconds
Tx Hold Count: 3
Path Cost Default Type: 32-bit
STP Traps: Enabled
ERS4526(config-if)#show spanning-tree rstp port config 1/2
Port: 1/2
----------
Port Priority (hex): 80
Port Path Cost: 200000
Port Protocol Migration: False
Port Admin Edge Status: False
Port Oper Edge Status: False
Port Admin P2P Status: Auto
Port Oper P2P Status: True
Port Oper Protocol Version: Rstp
ERS4526(config-if)#show spanning-tree rstp port config 1/8
Port: 1/8
----------
Port Priority (hex): 80
Port Path Cost: 20000
Port Protocol Migration: False
Port Admin Edge Status: False
Port Oper Edge Status: False
Port Admin P2P Status: Auto
Port Oper P2P Status: True
Port Oper Protocol Version: Rstp
Thank,

RE: Avaya ERS4526 Trap: RSTP Topology Change

Vali_Ene — Thu, 31 May 2018 10:56:00 GMT

From the show spanning-tree rsts port config 1/2 and 1/8 I can see that the Edge-Port is disabled on both ports (The line "Port Admin Edge Status: False"). It's absolutely normal to have Topology Change when those ports are moving from up to down or vice-versa as they are full STP enabled.
You must config the access ports as edge-ports using the following example:

4524GT>ena
4524GT#conf t
4524GT(config)#interf fast 1-10
4524GT(config-if)#spanning-tree rstp port 1-10 edge-port true
4524GT(config-if)#show spanning-tree rstp port config 1

Port: 1
----------
Port Priority (hex): 80
Port Path Cost: 20000
Port Protocol Migration: False
Port Admin Edge Status: True
Port Oper Edge Status: True
Port Admin P2P Status: Auto
Port Oper P2P Status: True
Port Oper Protocol Version: Rstp

RE: Avaya ERS4526 Trap: RSTP Topology Change

Thuy_Vu — Thu, 31 May 2018 10:56:00 GMT

Hi,
What's about interface connect to Access-Point? To configure edge-port or non-edge port

Thanks,

RE: Avaya ERS4526 Trap: RSTP Topology Change

Vali_Ene — Thu, 31 May 2018 10:56:00 GMT

If there is any chance to create a loop on those ports then let them full STP. If you don't have a too fancy topology and there is no chance that someone to create a loop using the APs uplinks then edge ports are just fine. You must keep in mind a very simple fact: enable STP only on ports that are susceptible to loops - every Topology Change sent in the switched network means a flush MAC forwarding table on every switch in your network, flooding of frames until the MAC tables are rebuild etc