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Server Farm Switches STP issue with NIC bridging

Namal Suranga
Level 1
Level 1

Hi All,

I have faced a problem with configuring Cisco 3750G series switches as Sever farm switches with redudance. i have attaced basic connectivity diagram with this..

ISRV.jpg

Switch model -

WS-C3750G-24T

IOS -

C3750-IPSERVICES-M

servers have 2NIC (1GBps) and both are bridged for redundant connections.

In both switches all ports get green coluor except one port on Secondary SW. I saw some Spanning tree block port status on that switch .. I thougt that is normal behavior ...

when i type Show cdp neghbor command on switch i can see other switch through a server connected port. Also Spannig tree root bridge election is occured through that port . Simply i need to configure both switches to pass traffic through there uplinks them selves.. but it seems like Secondry switch pass its traffic through primary switch ( i think according to STP ) using interconnection of bridge port of a server. Is there any possibilty for eliminate this..pls help me find out this thing.

Here are some captures ..

sfsw-01#sh vlan brief   (Primary Switch)

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

1    default                          active    Gi1/0/1, Gi1/0/2, Gi1/0/3

                                                Gi1/0/4, Gi1/0/5, Gi1/0/6

                                                Gi1/0/8, Gi1/0/9, Gi1/0/10

                                                Gi1/0/11, Gi1/0/12, Gi1/0/13

                                                Gi1/0/14, Gi1/0/15, Gi1/0/16

                                                Gi1/0/17, Gi1/0/18, Gi1/0/19

                                                Gi1/0/20, Gi1/0/21, Gi1/0/22

                                                Gi1/0/23, Gi1/0/24

1002 fddi-default                     act/unsup

1003 token-ring-default               act/unsup

1004 fddinet-default                  act/unsup

1005 trnet-default                    act/unsup

sfsw-01#sh spanning-tree vlan 1 (Primary switch)

VLAN0001

  Spanning tree enabled protocol ieee

  Root ID    Priority    24577

             Address     0018.baf3.4980

             This bridge is the root

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    24577  (priority 24576 sys-id-ext 1)

             Address     0018.baf3.4980

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

             Aging Time 300

Interface        Role Sts Cost      Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Gi1/0/1          Desg FWD 4         128.1    P2p

Gi1/0/3          Desg FWD 4         128.3    Edge P2p

Gi1/0/4          Desg FWD 4         128.4    Edge P2p

Gi1/0/5          Desg FWD 19        128.5    P2p

Gi1/0/6          Desg FWD 19        128.6    Edge P2p

Gi1/0/7          Desg FWD 19        128.7    P2p

Gi1/0/10         Desg FWD 4         128.10   Edge P2p

Gi1/0/11         Desg FWD 4         128.11   Edge P2p

Gi1/0/13         Desg FWD 4         128.13   Edge P2p

Gi1/0/19         Desg FWD 4         128.19   Edge P2p

Gi1/0/23         Desg FWD 19        128.23   Edge P2p

Gi1/0/24         Desg FWD 19        128.24   Edge P2p

sfsw-02#sh vl br (Secondry Switch)

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

1    default                          active    Gi1/0/1, Gi1/0/2, Gi1/0/3

                                                Gi1/0/4, Gi1/0/5, Gi1/0/6

                                                Gi1/0/7, Gi1/0/8, Gi1/0/9

                                                Gi1/0/10, Gi1/0/11, Gi1/0/12

                                                Gi1/0/13, Gi1/0/14, Gi1/0/15

                                                Gi1/0/16, Gi1/0/17, Gi1/0/18

                                                Gi1/0/19, Gi1/0/20, Gi1/0/21

                                                Gi1/0/22, Gi1/0/23, Gi1/0/24

1002 fddi-default                     act/unsup

1003 token-ring-default               act/unsup

1004 fddinet-default                  act/unsup

1005 trnet-default                    act/unsup

sfsw-02#sh spanning-tree vl 1 (Secondry Switch)

VLAN0001

  Spanning tree enabled protocol ieee

  Root ID    Priority    24577

             Address     0018.baf3.4980

             Cost        14

             Port        5 (GigabitEthernet1/0/5)

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    28673  (priority 28672 sys-id-ext 1)

             Address     0018.baf3.4100

             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

             Aging Time 300

Interface        Role Sts Cost      Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Gi1/0/1          Altn BLK 19        128.1    P2p

Gi1/0/2          Desg FWD 4         128.2    Edge P2p

Gi1/0/3          Desg FWD 4         128.3    Edge P2p

Gi1/0/4          Desg FWD 4         128.4    Edge P2p

Gi1/0/5          Root FWD 4         128.5    P2p

Gi1/0/7          Desg FWD 4         128.7    Edge P2p

Gi1/0/8          Desg FWD 4         128.8    Edge P2p

Gi1/0/9          Desg FWD 4         128.9    Edge P2p

Gi1/0/10         Desg FWD 4         128.10   Edge P2p

Gi1/0/14         Desg FWD 4         128.14   Edge P2p

Gi1/0/15         Desg FWD 4         128.15   Edge P2p

Gi1/0/17         Desg FWD 19        128.17   Edge P2p

Gi1/0/23         Desg FWD 19        128.23   Edge P2p

1 Accepted Solution

Accepted Solutions

mahmoodmkl
Level 7
Level 7

as per stp one link will in blocking state on one of the switches and this normal

Sent from Cisco Technical Support iPhone App

View solution in original post

1 Reply 1

mahmoodmkl
Level 7
Level 7

as per stp one link will in blocking state on one of the switches and this normal

Sent from Cisco Technical Support iPhone App

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