Hello. I’m experiencing a link flapping issue with my MikroTik Cloud Router (CCR2116-12G-4S+). I have the ISP link connected to ether3. The setup is such that the MikroTik is connected to a switch that belongs to the ISP, which in turn is connected to the ISP’s router. As a result, I’m not receiving the uplink directly from the ISP router.
I’ve tried replacing the LAN cable (for the ISP uplink) multiple times, but I continue to see the link flapping with messages like “Link OK,” “Unknown,” and “No cable detected.” The strange thing is that I should have an immediate Internet connection, since the cable is directly attached to the ISP’s switch. However, when I attempt to ping the gateway, I get “No route to host” or “Timeout” errors.
Also, I’ve tried all the ports on the router, but the flapping issue persists. Additionally, whenever I connect another device to the router on any port, the router goes down, and all the links start flapping.
and, I’ve already reported this issue to the ISP, but I wanted to check if anyone here has encountered a similar problem before…
Any help would be greatly appreciated!!!
Can you supply some additional information:
- what switch (brand/type)
- what RouterOS and firmware version?
Can you also provide the config?
/export file=anynameyoulike
Remove serial and any other private info, post between code tags by using the </> button.
Can you test with a switch in between the ISP switch and the RB?
And can you please have one topic for this problem:
http://forum.mikrotik.com/t/assistance-needed-asap/181551/1
- The switch is Cisco switch (not a dump one lol)
- Mikrotik cloud router: 7.16.2 and firmware: v7.16.2
- About placing a switch in between, I didn’t try that yet…
Cloud router:
# 1970-01-02 20:33:37 by RouterOS 7.16.2
# software id =
#
# model = CCR2116-12G-4S+
# serial number
/interface bridge
add name=bridge1
/interface ethernet
set [ find default-name=ether3 ] loop-protect=off name=ISP
/interface wireguard
add listen-port=13231 mtu=1420 name=wireguard1
/interface list
add name=LAN
add name=WAN
/ip pool
add name=dhcp_pool0 ranges
/port
set 0 name=serial0
/interface bridge port
add bridge=bridge1 interface=ether2
/ip neighbor discovery-settings
set discover-interface-list=all
/interface list member
add interface=bridge1 list=LAN
add interface=ether13 list=WAN
/interface wireguard peers
add allowed-address= interface=wireguard1 name=\
/ip address
add address= interface=ISP network=
add address= interface=bridge1 network=
/ip dhcp-server
add address-pool=dhcp_pool0 interface=bridge1 lease-time=10h30m name=dhcp1
/ip dhcp-server network
add address=
/ip dns
set servers=
/ip firewall filter
add action=accept chain=input connection-state=established,related,untracked \
in-interface=ISP
/ip firewall nat
add action=masquerade chain=srcnat out-interface-list=WAN
/ip route
/ip service
set ftp disabled=yes
set www disabled=yes
set ssh disabled=yes
set api disabled=yes
set api-ssl disabled=yes
/system note
set show-at-login=no
/system package update
set channel=long-term
/system routerboard settings
set auto-upgrade=yes enter-setup-on=delete-key
/tool mac-server
set allowed-interface-list=LAN