05-07-2010 11:34 AM - edited 03-06-2019 10:59 AM
I've got a problem I can't quite pin down.
I have two 6500s running VRRP on 12.2(33)SXH3. One particular svi on Core2, interface vlan20, is having some trouble.
Core 1:
interface Vlan20
description Server VLAN
ip address 10.100.20.2 255.255.255.0
ip flow ingress
vrrp 20 ip 10.100.20.1
vrrp 20 priority 250
!
spanning-tree vlan 20 priority 8192
Core 2
interface Vlan20
description Server VLAN
ip address 10.100.20.3 255.255.255.0
vrrp 20 ip 10.100.20.1
!
spanning-tree vlan 20 priority 16384
There's a server on this vlan with an IP of 10.100.20.86 that only Core 1 can ping. If I ping from Core 2, it fails. If I shutdown vlan20 on Core2, then Core2 can ping the IP just fine.
Server has the same mask as the routers and has a default gateway of the vrrp IP.
While the interface is up/up, a ping to all other IPs on that subnet (from Core2) provides 4/5 ping returns ( .!!!! )
Any thoughts?
thanks!
05-07-2010 01:04 PM
How is your trunk looks like for both Core1 and Core2??
Regards,
jerry
05-07-2010 01:23 PM
Strange... Vlan20 isn't forwarding on Core2. Why not?
CORE-01# show int po1 trunk
Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 1
Port Vlans allowed on trunk
Po1 1-4094
Port Vlans allowed and active in management domain
Po1 1-2,10,12,19-20,22-25,30-33,35-36,40,50-54,64,68,84,99,104,112,126,128,136,160,172,176,192,702-703,999-1000
Port Vlans in spanning tree forwarding state and not pruned
Po1 1-2,10,12,19-20,22-25,30-33,35-36,40,50-54,64,68,84,99,104,112,126,128,136,160,172,176,192,702-703,999-1000
CORE-02# show int po1 trunk
Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 1
Port Vlans allowed on trunk
Po1 1-4094
Port Vlans allowed and active in management domain
Po1 1-2,10,12,19-20,22-25,30-33,35-36,40,50,64,68,84,99,104,112,128,136,160,172,176,192,702-703,999-1000
Port Vlans in spanning tree forwarding state and not pruned
Po1 1-2,12,19,22-25,30-33,35,40,50,68,84,99,104,112,128,136,160,172,176,192,702-703,999-1000
05-07-2010 01:26 PM
Please post the following outputs for both switches:
show spanning-tree vlan 20
show run interface po 1
show vtp status
Regards,
jerry
05-07-2010 01:33 PM
CORE-01#show run int po1
Building configuration...
Current configuration : 140 bytes
!
interface Port-channel1
description EtherChannel to Core 2
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
end
CORE-01#show spanning-tree vlan 20
VLAN0020
Spanning tree enabled protocol ieee
Root ID Priority 4116
Address 000d.ecea.f53c
Cost 2
Port 259 (TenGigabitEthernet3/3)
Hello Time 4 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 8192
Address 0014.1bf4.1c14
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 480
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te3/1 Desg FWD 2 128.257 P2p
Te3/2 Desg FWD 2 128.258 P2p
Te3/3 Root FWD 2 128.259 P2p
Te3/4 Desg FWD 2 128.260 P2p
Gi4/9 Desg FWD 4 128.393 P2p
Gi4/11 Desg FWD 4 128.395 P2p
Gi4/13 Desg FWD 4 128.397 P2p
Gi4/14 Desg FWD 4 128.398 P2p
Gi4/17 Desg FWD 4 128.401 P2p
Gi4/18 Desg FWD 4 128.402 P2p
Gi4/19 Desg FWD 4 128.403 P2p
Gi4/23 Desg FWD 4 128.407 P2p
Gi4/24 Desg FWD 4 128.408 P2p
Gi4/25 Desg FWD 4 128.409 P2p
Gi4/26 Desg FWD 4 128.410 P2p
Gi4/29 Desg FWD 4 128.413 P2p
Gi4/30 Desg FWD 4 128.414 P2p
Gi4/31 Desg FWD 4 128.415 P2p
Gi4/32 Desg FWD 4 128.416 P2p
Gi4/33 Desg FWD 4 128.417 P2p
Gi4/35 Desg FWD 4 128.419 P2p
Gi4/36 Desg FWD 4 128.420 P2p
Gi4/37 Desg FWD 4 128.421 P2p
Gi5/8 Desg FWD 4 128.520 P2p
Gi5/11 Desg FWD 4 128.523 P2p
Gi5/13 Desg FWD 4 128.525 P2p
Gi5/14 Desg FWD 4 128.526 P2p
Gi5/17 Desg FWD 4 128.529 P2p
Gi5/20 Desg FWD 4 128.532 P2p
Gi5/21 Desg FWD 4 128.533 P2p
Gi5/22 Desg FWD 4 128.534 P2p
Gi5/23 Desg FWD 4 128.535 P2p
Gi5/27 Desg FWD 4 128.539 P2p
Gi5/28 Desg FWD 4 128.540 P2p
Gi5/29 Desg FWD 4 128.541 P2p
Gi5/30 Desg FWD 4 128.542 P2p
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Po1 Desg FWD 3 128.1665 P2p
Po2 Desg FWD 3 128.1666 P2p
Po3 Desg FWD 3 128.1667 P2p
Po5 Desg FWD 3 128.1669 P2p
CORE-01# show vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs : 43
VTP Operating Mode : Transparent
VTP Domain Name : net
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xFB 0x40 0xC2 0x1C 0xE6 0xBC 0x6F 0xE4
Configuration last modified by 10.100.2.2 at 0-0-00 00:00:00
CORE-02#show spanning-tree vlan 20
VLAN0020
Spanning tree enabled protocol ieee
Root ID Priority 4116
Address 000d.ecea.f53c
Cost 4
Port 257 (TenGigabitEthernet3/1)
Hello Time 4 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 16384
Address 0014.1bef.2d14
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 480
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te3/1 Root FWD 2 128.257 P2p
Gi4/1 Desg FWD 4 128.385 P2p
Gi4/2 Desg FWD 4 128.386 P2p
Gi4/4 Desg FWD 4 128.388 P2p
Gi4/7 Desg FWD 4 128.391 P2p
Gi4/11 Desg FWD 4 128.395 P2p
Gi4/12 Desg FWD 4 128.396 P2p
Gi4/14 Desg FWD 4 128.398 P2p
Gi4/18 Desg FWD 4 128.402 P2p
Gi4/19 Desg FWD 4 128.403 P2p
Gi4/23 Desg FWD 4 128.407 P2p
Gi4/24 Desg FWD 4 128.408 P2p
Gi4/25 Desg FWD 4 128.409 P2p
Gi4/26 Desg FWD 4 128.410 P2p
Gi4/28 Desg FWD 4 128.412 P2p
Gi4/29 Desg FWD 4 128.413 P2p
Gi4/30 Desg FWD 4 128.414 P2p
Gi4/31 Desg FWD 4 128.415 P2p
Gi4/32 Desg FWD 4 128.416 P2p
Gi4/33 Desg FWD 4 128.417 P2p
Gi4/34 Desg FWD 4 128.418 P2p
Gi4/35 Desg FWD 4 128.419 P2p
Gi4/36 Desg FWD 4 128.420 P2p
Gi4/37 Desg FWD 4 128.421 P2p
Gi5/8 Desg FWD 4 128.520 P2p
Gi5/11 Desg FWD 4 128.523 P2p
Gi5/13 Desg FWD 4 128.525 P2p
Gi5/14 Desg FWD 4 128.526 P2p
Gi5/20 Desg FWD 4 128.532 P2p
Gi5/21 Desg FWD 4 128.533 P2p
Gi5/22 Desg FWD 4 128.534 P2p
Gi5/23 Desg FWD 4 128.535 P2p
Gi5/27 Desg FWD 4 128.539 P2p
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi5/30 Desg FWD 4 128.542 P2p
Po1 Altn BLK 3 128.1665 P2p
Po2 Desg FWD 3 128.1666 P2p
Po3 Desg FWD 3 128.1667 P2p
Po5 Desg FWD 3 128.1669 P2p
CORE-02#show vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs : 38
VTP Operating Mode : Transparent
VTP Domain Name : net
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x64 0xF1 0x50 0x1A 0x62 0xD8 0x95 0x8F
Configuration last modified by 10.100.2.3 at 0-0-00 00:00:00
CORE-02#show run int po1
Building configuration...
Current configuration : 140 bytes
!
interface Port-channel1
description EtherChannel to Core 1
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
end
05-07-2010 01:43 PM
Okay, Core2's spanning tree shows that PO1 is blocked for VL20
CORE-02#show spanning-tree vlan 20
VLAN0020
Spanning tree enabled protocol ieee
Root ID Priority 4116
Address 000d.ecea.f53c
Cost 4
Port 257 (TenGigabitEthernet3/1)
Hello Time 4 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 16384
Address 0014.1bef.2d14
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 480
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te3/1 Root FWD 2 128.257 P2p
Gi4/1 Desg FWD 4 128.385 P2p
Gi4/2 Desg FWD 4 128.386 P2p
Gi4/4 Desg FWD 4 128.388 P2p
Gi4/7 Desg FWD 4 128.391 P2p
Gi4/11 Desg FWD 4 128.395 P2p
Gi4/12 Desg FWD 4 128.396 P2p
Gi4/14 Desg FWD 4 128.398 P2p
Gi4/18 Desg FWD 4 128.402 P2p
Gi4/19 Desg FWD 4 128.403 P2p
Gi4/23 Desg FWD 4 128.407 P2p
Gi4/24 Desg FWD 4 128.408 P2p
Gi4/25 Desg FWD 4 128.409 P2p
Gi4/26 Desg FWD 4 128.410 P2p
Gi4/28 Desg FWD 4 128.412 P2p
Gi4/29 Desg FWD 4 128.413 P2p
Gi4/30 Desg FWD 4 128.414 P2p
Gi4/31 Desg FWD 4 128.415 P2p
Gi4/32 Desg FWD 4 128.416 P2p
Gi4/33 Desg FWD 4 128.417 P2p
Gi4/34 Desg FWD 4 128.418 P2p
Gi4/35 Desg FWD 4 128.419 P2p
Gi4/36 Desg FWD 4 128.420 P2p
Gi4/37 Desg FWD 4 128.421 P2p
Gi5/8 Desg FWD 4 128.520 P2p
Gi5/11 Desg FWD 4 128.523 P2p
Gi5/13 Desg FWD 4 128.525 P2p
Gi5/14 Desg FWD 4 128.526 P2p
Gi5/20 Desg FWD 4 128.532 P2p
Gi5/21 Desg FWD 4 128.533 P2p
Gi5/22 Desg FWD 4 128.534 P2p
Gi5/23 Desg FWD 4 128.535 P2p
Gi5/27 Desg FWD 4 128.539 P2p
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi5/30 Desg FWD 4 128.542 P2p
Po1 Altn BLK 3 128.1665 P2p
Po2 Desg FWD 3 128.1666 P2p
Po3 Desg FWD 3 128.1667 P2p
Po5 Desg FWD 3 128.1669 P2p
What switch is this 0014.1bef.2d14 root bridge? You need to trace the spanning tree to look for inconsistance toward the root.
Regards,
jerry
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