Hello guys.

Currently we are facing a lot of issues with CRS switches. Sometimes, they stop forwarding mac addresses and so. We have a huge infrastructure with a lot of VLANS.

Our main issue to be solved is that our trunk switches (CRS326) suddenly stop answering at our network (No ping, no mac-telnet, nothing). They stop without any message or error in logs. We have currently one switch at our network plugged at a serial console to investigate further, because as we reboot them they become accessible again. We did a SUPOUT file, but no problems so far.

Did anyone got those behavior in those switches too?

/system routerboard print
routerboard: yes
model: CRS317-1G-16S+
serial-number: 8ED50825414D
firmware-type: dx3230L
factory-firmware: 6.41
current-firmware: 6.45.9

And our bridge vlan configuration:

/interface bridge vlan> print
Flags: X - disabled, D - dynamic
# BRIDGE VLAN-IDS CURRENT-TAGGED CURRENT-UNTAGGED
0 ;;; MANAGEMENT
ROOT 100 ROOT
sfp-sfpplus1
sfp-sfpplus14
sfp-sfpplus15
sfp-sfpplus16
sfp-sfpplus12
MANAGEMENT
1 ;;; SUBIDA
ROOT 5 ROOT sfp-sfpplus1
sfp-sfpplus16 sfp-sfpplus3
sfp-sfpplus7
sfp-sfpplus8
sfp-sfpplus11
sfp-sfpplus14
sfp-sfpplus15

Also, we created a VLAN at ROOT with VID=100. They work for a while but suddenly it stops responding at our network, and other switches in the same network (but another location) passing by those inacessible switches work fine.

Our HOST table at bridge show a lot of hosts (other switches) in the same VID:

/interface bridge host> print where vid=100
Flags: X - disabled, I - invalid, D - dynamic, L - local, E - external
# MAC-ADDRESS VID ON-INTERFACE BRIDGE AGE
0 D E 00:1E:67:77:A9:2C 100 sfp-sfpplus14 ROOT
1 D E 44:31:92:48:94:C2 100 sfp-sfpplus16 ROOT
2 D E 44:31:92:FD:F3:B9 100 sfp-sfpplus16 ROOT
3 D E 44:31:92:FD:F7:01 100 sfp-sfpplus16 ROOT
4 D E 44:31:92:FE:4D:41 100 sfp-sfpplus16 ROOT
5 D E 4C:1F:CC:17:BD:15 100 sfp-sfpplus16 ROOT
6 D E 6C:3B:6B:84:44:AD 100 sfp-sfpplus12 ROOT
7 D E 6C:3B:6B:A7:2C:3E 100 sfp-sfpplus16 ROOT
8 D E CC:2D:E0:AE:DD:2C 100 sfp-sfpplus16 ROOT
9 DL CC:2D:E0:AE:F2:5F 100 ROOT ROOT
10 DL CC:2D:E0:AE:F2:6A 100 sfp-sfpplus12 ROOT
11 DL CC:2D:E0:AE:F2:6C 100 sfp-sfpplus14 ROOT
12 DL CC:2D:E0:AE:F2:6D 100 sfp-sfpplus15 ROOT
13 DL CC:2D:E0:AE:F2:6E 100 sfp-sfpplus16 ROOT
14 D E CC:3E:5F:17:0F:FC 100 sfp-sfpplus16 ROOT
15 D E D0:7E:28:54:B8:E8 100 sfp-sfpplus16 ROOT

But ARP table is empty:

/ip arp print
Flags: X - disabled, I - invalid, H - DHCP, D - dynamic, P - published,
C - complete
# ADDRESS MAC-ADDRESS INTERFACE
0 D 172.16.255.240 MANAGEMENT

What is going on?

Best regards,

Artur Portella.

Could be many things not knowing what your network topology and device configurations are.

If you have many switches and interconnections then spanning tree can block some traffic if incorrectly configured - with VLANs you should use either RSTP with all VLANs configured on all trunk links, or more correctly MSTP.

All our switches are STP disabled, may this can be the problem?

All our switches are STP disabled, may this can be the problem?

If there are no loops in the network, no.