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SVI / VRRP Problem?

Cisco Contracts
Level 1
Level 1

‎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!

Labels:
0 Helpful
5 Replies 5

Jerry Ye
Cisco Employee
Cisco Employee

‎05-07-2010 01:04 PM

How is your trunk looks like for both Core1 and Core2??

Regards,

jerry

0 Helpful

Cisco Contracts
Level 1
Level 1
In response to Jerry Ye

‎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

0 Helpful

Jerry Ye
Cisco Employee
Cisco Employee
In response to Cisco Contracts

‎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

0 Helpful

Cisco Contracts
Level 1
Level 1
In response to Cisco Contracts

‎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

0 Helpful

Jerry Ye
Cisco Employee
Cisco Employee
In response to Cisco Contracts

‎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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