Avaya ERS4526 Trap: RSTP Topology Change

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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,
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Thuy Vu

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Posted 4 weeks ago

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Vali Ene

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

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Hi,

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

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  • 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)

(Edited)
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Thuy Vu

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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,
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Vali Ene

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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
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Thuy Vu

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

Thanks,
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Vali Ene

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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 
(Edited)