cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements
Join Customer Connection to register!
479
Views
0
Helpful
1
Replies
Namal Suranga
Beginner

Server Farm Switches STP issue with NIC bridging

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
Rising star

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
Rising star

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