Re: VLAN STP showing BLK - Page 2

support1@lima.co.uk · ‎02-25-2023

Hi all,

I have applied STP to interface 1/34/1 and attemping to use 1/33 as the default path for traffic, it is still showing BLK... any suggestions.

conf interface e1/34/1
spanning-tree vlan 104 cost 2500
spanning-tree vlan 107 cost 2500
spanning-tree vlan 109 cost 2500
spanning-tree vlan 110 cost 2500
spanning-tree vlan 129 cost 2500
spanning-tree vlan 132 cost 2500
spanning-tree vlan 150 cost 2500
spanning-tree vlan 151 cost 2500

interface Ethernet1/33
spanning-tree port type network
interface Ethernet1/34/1
spanning-tree port type network
spanning-tree vlan 104,107,109-110,129,132,150-151 cost 2500

VLAN0107
Spanning tree enabled protocol rstp
Root ID Priority 107
Address 0023.04ee.be0a
Cost 3500
Port 133 (Ethernet1/34/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32875 (priority 32768 sys-id-ext 107)
Address 70ea.1a71.8fd3
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po1 Desg FWD 250 128.4096 (vPC peer-link) Network P2p
Eth1/2 Desg FWD 500 128.5 P2p
Eth1/3 Desg FWD 500 128.9 P2p
Eth1/4 Desg FWD 500 128.13 P2p
Eth1/7 Desg FWD 500 128.25 P2p
Eth1/9 Desg FWD 500 128.33 P2p
Eth1/10 Desg FWD 500 128.37 P2p
Eth1/11 Desg FWD 500 128.41 P2p
Eth1/12 Desg FWD 500 128.45 P2p
Eth1/13 Desg FWD 500 128.49 P2p
Eth1/14 Desg FWD 500 128.53 P2p
Eth1/15 Desg FWD 500 128.57 P2p
Eth1/16 Desg FWD 500 128.61 P2p
Eth1/17 Desg FWD 500 128.65 P2p
Eth1/22 Desg FWD 500 128.85 P2p
Eth1/23 Desg FWD 500 128.89 P2p
Eth1/24 Desg FWD 500 128.93 P2p
Eth1/27 Desg FWD 500 128.105 P2p
Eth1/28 Desg FWD 500 128.109 P2p
Eth1/33 Altn BLK 2000 128.129 Network P2p
Eth1/34/1 Root FWD 2500 128.133 Network P2p

Should the above be showing at Root on 1/33 ??

support1@lima.co.uk · ‎02-26-2023

This is what I have also spotted. unsure how to resolve it though. Could it be that the although the interface is set to 10gb on both the 1/34/1 is using a 40gb sfp whilst the 1/33 is using a 10gb sfp?

Eth1/33 <---uplink to - connected trunk full 10G 10Gbase-LR
Eth1/34/1 <---uplink to - connected trunk full 10G QSFP-40G-CSR4

paul driver · ‎02-26-2023

Hello
The manual added stp cost applied on the interface would over ride any default calculated stp cost from the interface, As I have stated check the upstream switch on eth1/33 and see how the stp path is from there or if applicable shutdown eth1/34/1 on this switch and see the stp calculation thereafter, from what I see and interpret does suggest some physical failure hence why even eth1/34/1 has a less preferred stp cost path its still being preferred.

Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

support1@lima.co.uk · ‎02-26-2023

# SHOW INT ETH1/33
Ethernet1/33 is up
admin state is up, Dedicated Interface
Hardware: 10000/25000/40000/50000/100000 Ethernet, address: 70ea.1a71.9054 (bia 70e
a.1a71.9054)
Description: <---uplink to -S80-SDDC02--->
MTU 9216 bytes, BW 10000000 Kbit , DLY 10 usec
reliability 255/255, txload 4/255, rxload 4/255
Encapsulation ARPA, medium is broadcast
Port mode is trunk
full-duplex, 10 Gb/s, media type is 10G
Beacon is turned off
Auto-Negotiation is turned on FEC mode is Auto
Input flow-control is off, output flow-control is off
Auto-mdix is turned off
Rate mode is dedicated
Switchport monitor is off
EtherType is 0x8100
EEE (efficient-ethernet) : n/a
admin fec state is auto, oper fec state is off
Last link flapped 70week(s) 2day(s)
Last clearing of "show interface" counters never
1 interface resets
Load-Interval #1: 30 seconds

# SHOW INT ETH1/34/1
Ethernet1/34/1 is up
admin state is up, Dedicated Interface
Hardware: 10000 Ethernet, address: 70ea.1a71.9058 (bia 70ea.1a71.9058)
Description: <---uplink to -S40-SDDC01--->
MTU 9216 bytes, BW 10000000 Kbit , DLY 10 usec
reliability 255/255, txload 59/255, rxload 83/255
Encapsulation ARPA, medium is broadcast
Port mode is trunk
full-duplex, 10 Gb/s, media type is 40G
Beacon is turned off
Auto-Negotiation is turned on FEC mode is Auto
Input flow-control is off, output flow-control is off
Auto-mdix is turned off
Rate mode is dedicated
Switchport monitor is off
EtherType is 0x8100
EEE (efficient-ethernet) : n/a
admin fec state is auto, oper fec state is off