12-14-2018 01:11 PM - edited 03-08-2019 04:49 PM
link getting Down & UP for every 12 0r 24 hour
we have to core switch one old network and onther new network
so we make trunk between old and new network
old network trunk configuration
interface GigabitEthernet0/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 8,12
switchport mode trunk
spanning-tree guard root
new network trunk configuration
interface TenGigabitEthernet1/1/13
description *** Connected to SW-3560-A ***
switchport trunk allowed vlan 8,12
switchport mode trunk
end
for spanning for old network for vlan 8 & 12
VLAN0008
Spanning tree enabled protocol ieee
Root ID Priority 24584
Address 0026.0b06.ff80
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 24584 (priority 24576 sys-id-ext 8)
Address 0026.0b06.ff80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi0/1 Desg FWD 4 128.1 P2p
Gi0/2 Desg FWD 4 128.2 P2p
Fa0/12 Desg FWD 19 128.14 P2p
Fa0/21 Desg FWD 19 128.23 P2p Edge
VLAN0012
Spanning tree enabled protocol ieee
Root ID Priority 32768
Address 24d9.2126.0001
Cost 27
Port 2 (GigabitEthernet0/2)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32780 (priority 32768 sys-id-ext 12)
Address 0026.0b06.ff80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi0/1 Desg FWD 4 128.1 P2p
Gi0/2 Root FWD 4 128.2 P2p
Fa0/12 Desg FWD 19 128.14 P2p
for network spanning tree for vlan 8 & 12
VLAN0008
Spanning tree enabled protocol rstp
Root ID Priority 24584
Address 0026.0b06.ff80
Cost 4
Port 13 (TenGigabitEthernet1/1/13)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32776 (priority 32768 sys-id-ext 8)
Address 0008.e3ff.fd90
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/1/13 Root FWD 4 128.13 P2p Peer(STP)
Po1 Desg FWD 3 128.2561 P2p Peer(STP)
Po2 Desg FWD 3 128.2562 P2p Peer(STP)
Po3 Desg FWD 3 128.2563 P2p Peer(STP)
Po4 Desg FWD 3 128.2564 P2p Peer(STP)
Po5 Desg FWD 3 128.2565 P2p Peer(STP)
Po250 Desg FWD 3 128.2810 P2p Peer(STP)
VLAN0012
Spanning tree enabled protocol rstp
Root ID Priority 32768
Address 24d9.2126.0001
Cost 31
Port 13 (TenGigabitEthernet1/1/13)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32780 (priority 32768 sys-id-ext 12)
Address 0008.e3ff.fd90
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/1/13 Root FWD 4 128.13 P2p Peer(STP)
Po1 Desg FWD 3 128.2561 P2p Peer(STP)
Po2 Desg FWD 3 128.2562 P2p Peer(STP)
Po3 Desg FWD 3 128.2563 P2p Peer(STP)
Po4 Desg FWD 3 128.2564 P2p Peer(STP)
Po5 Desg FWD 3 128.2565 P2p Peer(STP)
Po250 Desg FWD 3 128.2810 P2p Peer(STP)
12-15-2018 01:38 AM
Hello,
what do the logs show as the reason for the interfaces, or the links, going down ?
12-15-2018 01:52 AM
Hello
Thanks
old networks logs switch log
12-15-2018 02:16 AM
Hello,
what does your topology look like ? The 4500 is a much bigger switch (as opposed to the 3560) and should ideally be the root.
Either way, if you need to keep the 3560 as the root, try and manually set the root priority for your VLANs on the 3560:
spanning-tree vlan 8 priority 1
spanning-tree vlan 12 priority 1
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