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Two routers into one switch
Essentially connecting two routers into one switch. I have a GS752TPP in a secondary cabinet fed from the first cabinet. There are two incoming connections into the cabinet giving DHCP. O...
Here is the potential solution although not perfect yet!
Set up one of the network (main data network) on the management VLAN 1.
Set up second VLAN for telephone network. No DHCP, No IP, e.g. VLAN 200 and select ports.
Set all ports on VLAN 200 to Access ports.
Remove VLAN 1 from all ports on VLAN 200.
In theory, ready to plug in second DHCP uplink into a port on VLAN 200
This causes entire data network to stop - some sort of loop - errors below.
LLDP-6-NEIGHBOR_DEL proto_lldp.c(4957) %% Neighbor deleted on port GigabitEthernet2: Chassis ID xx:xx:xx:xx:xx:xx, Port ID 0/12
LLDP-6-NEIGHBOR_DEL proto_lldp.c(4957) %% Neighbor deleted on port GigabitEthernet2: Chassis ID 00:00:00:00:00:00, Port ID xx:xx:xx:xx:xx:xx
LLDP-6-NEIGHBOR_DEL proto_lldp.c(4957) %% Neighbor deleted on port GigabitEthernet2: Chassis ID xx:xx:xx:xx:xx:xx, Port ID 0/44
STP-6-PORT_STATE proto_stp.c(820) %% Port GigabitEthernet2 moving from Forwarding to Disabled
TRAPMGR-5-PORT_LINK_DOWN ksi_snmp.c(230) %% Interface GigabitEthernet2 link down
LLDP-6-NEIGHBOR_DISCOVER proto_lldp.c(5156) %% New neighbor on port GigabitEthernet2: Chassis ID xx:xx:xx:xx:xx:xx, Port ID 0/12
LLDP-6-NEIGHBOR_DISCOVER proto_lldp.c(5156) %% New neighbor on port GigabitEthernet2: Chassis ID 00:00:00:00:00:00, Port ID xx:xx:xx:xx:xx:xx
LLDP-6-NEIGHBOR_DISCOVER proto_lldp.c(5156) %% New neighbor on port GigabitEthernet2: Chassis ID xx:xx:xx:xx:xx:xx, Port ID 0/44
TRAPMGR-5-STP_TC ksi_snmp.c(486) %% Bridge topology change.
STP-6-PORT_STATE proto_stp.c(820) %% Port GigabitEthernet2 moving from Blocking to Forwarding
<182>1 2022-04-28T16:43:41.310+1:00Z 192.xxx.xxx.199-1 STP-6-PORT_STATE proto_stp.c(820) %% Port GigabitEthernet2 moving from Disabled to Blocking
<181>1 2022-04-28T16:43:41.300+1:00Z 192.xxx.xxx.199-1 TRAPMGR-5-PORT_LINK_UP ksi_snmp.c(232) %% Interface GigabitEthernet2 link up
Disable Spanning Tree and everything works fine.
I am a little uncomfortable disabling spanning tree and the two VLANs are completely isolated.
Any ideas?
What is connected to that port #2?
Unfortunately your xx-ing of the neighbour MAC (keep at least the vendor OID visible) and the complete RFC1918 Private 192.x.x.x addresses almost the complete world is using does render the log useless.
Spanning Tree STP and RSRP does span the complete phyical network. If STP active does bring down a link there must be a reason - a reason in place even with STP/RSTP disabled, too. So strongly doubt everything is flawless ....
Unfortunately your xx-ing of the neighbour MAC (keep at least the vendor OID visible) and the complete RFC1918 Private 192.x.x.x addresses almost the complete world is using does render the log useless.
Spanning Tree STP and RSRP does span the complete phyical network. If STP active does bring down a link there must be a reason - a reason in place even with STP/RSTP disabled, too. So strongly doubt everything is flawless ....
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