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New Member

LAN Mess

Hi folks, we recently acquired a new company and I am trying to get my head wrapped around their network setup until I physically go out there to refresh the network.

I have a bit of a trivial situation and am wandering if someone can help me out.

I have 2 switches: Switch 4 and Switch 5 which are connected to one another over a trunk link

Switch 4 has Gi1/0/2 and Gi1/0/3 attached to a database server via a port channel (Po1). Server IP address is 192.168.218.19

Default Gateway for Switch 4 is Switch 5

When I do a traceroute to 192.168.218.19 from Switch4, trace goes to Switch 5 and then to 192.168.218.19

When I do show mac address-table address command on the MAC address of 192.168.218.19 on Switch 5, it says its connected to Gi1/0/1. Gi1/0/1 is connected to Switch4

When I go back to Switch4 and look up the MAC for 192.168.218.19, it says connected via Po1.

The database server has two NICs connecting to Switch 4 and two Connecting to Switch 5 for backup.

This causes a problem when I have a device connecting directly into Switch 4 and wants to send a file to the database server. It first goes from Switch 4 to Switch 5, then back over the trunk to Switch 4 and to the Po1.

Switch5 must stay as the default gateway for switch 4 as it's got further connectivity into the WAN from Switch 5.

Please advise how I can fix this?

6 REPLIES
New Member

LAN Mess

Below is an output of basically everything that I talk about in my previous post, in Cisco's language

Username: xxxx

Password:

SW4>

SW4>en

Password:

SW4#

SW4#traceroute 192.168.218.19

Type escape sequence to abort.

Tracing the route to 192.168.218.19

  1 172.18.6.16 0 msec 0 msec 0 msec

  2 192.168.218.19 0 msec 0 msec 8 msec

SW4#

SW4#

SW4#172.18.6.16

Trying 172.18.6.16 ... Open

User Access Verification

Username: xxxxxxxxx

Password:

SW5>en

Password:

SW5#

SW5#

SW5#sh arp | inc 192.168.218.19

Internet  192.168.218.19        121   0060.163e.49bf  ARPA   Vlan2

SW5#

SW5#

SW5#sh mac address-table address 0060.163e.49bf

          Mac Address Table

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

Vlan    Mac Address       Type        Ports

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

   2    0060.163e.49bf    DYNAMIC     Gi1/0/1

Total Mac Addresses for this criterion: 1

SW5#

SW5#sh cdp nei  

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID

SW3     Gig 1/0/18        176           S I      WS-C2960G Gig 0/2

SW3     Gig 1/0/20        176           S I      WS-C2960G Gig 0/1

SW4     Gig 1/0/2         149           S I      WS-C3750G Gig 1/0/1

SW4     Gig 1/0/1         154           S I      WS-C3750G Gig 1/0/2

SW5#sh run int gig1/0/1

interface GigabitEthernet1/0/1

description etherchanne to SW4

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 3 mode active

end

SW5#sh run int gig1/0/2

interface GigabitEthernet1/0/2

description etherchanne to SW4

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 3 mode active

end

SW5#

SW5#sh run int po3

interface Port-channel3

switchport trunk encapsulation dot1q

switchport mode trunk

end

SW5#

SW5#exit

[Connection to 172.18.6.16 closed by foreign host]

SW4#

SW4#sh mac address-table address 0060.163e.49bf

          Mac Address Table

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

Vlan    Mac Address       Type        Ports

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

   2    0060.163e.49bf    DYNAMIC     Po5

   1    0060.163e.49bf    DYNAMIC     Po5

Total Mac Addresses for this criterion: 2

SW4#

SW4#sh etherchannel summary

Flags:  D - down        P - in port-channel

        I - stand-alone s - suspended

        H - Hot-standby (LACP only)

        R - Layer3      S - Layer2

        U - in use      f - failed to allocate aggregator

        u - unsuitable for bundling

        w - waiting to be aggregated

        d - default port

Number of channel-groups in use: 4

Number of aggregators:           4

Group  Port-channel  Protocol    Ports

------+-------------+-----------+-----------------------------------------------

1      Po1(SD)         LACP      Gi1/0/24(I)

2      Po2(SD)          -       

3      Po3(SU)         LACP      Gi1/0/1(P) 

5      Po5(SU)         LACP      Gi1/0/3(P)  Gi1/0/4(P) 

SW4#sh run int gi1/0/3

Building configuration...

Current configuration : 157 bytes

!

interface GigabitEthernet1/0/3

description EMC_Active cge1

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 5 mode active

end

SW4#sh run int gi1/0/4

Building configuration...

Current configuration : 157 bytes

!

interface GigabitEthernet1/0/4

description EMC_Active cge2

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 5 mode active

end

SW4#sh run int po5

Building configuration...

Current configuration : 92 bytes

!

interface Port-channel5

switchport trunk encapsulation dot1q

switchport mode trunk

end

New Member

LAN Mess

Hi,

Could you provide a diagram of this setup? What switches are you using?

Adam

New Member

LAN Mess

Hi Adam, I quickly created a drawing as per your note. It's not a master-piece but it sort of will help put things into perspective.

ORANGE lines and arrows show how traffic flows from a client to the server currently.

GREEN lines and arrows show how it should be flowing.

Purple

LAN Mess

Hi,

Can you provide your running from sw4 and sw5 as well as ip config from client and server.

Regards.

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.
New Member

LAN Mess

Hi Alain, here are the configs. Thanks.

SWITCH 4

SW4#sh run

Building configuration...

Current configuration : 3537 bytes

!

version 12.2

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname SW4

!

enable secret xxxxxxxxx

!

username xxxxxxxxx password xxxxxxxxxxx

no aaa new-model

clock timezone UTC -5

clock summer-time UTC recurring

switch 1 provision ws-c3750g-24t

system mtu routing 1500

ip subnet-zero

!

!

!

!

no file verify auto

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

interface Port-channel1

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel2

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel3

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel5

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface GigabitEthernet1/0/1

description etherchannel to SW5

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 3 mode active

!

interface GigabitEthernet1/0/2

description etherchannel to SW5

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface GigabitEthernet1/0/3

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 5 mode active

!

interface GigabitEthernet1/0/4

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 5 mode active

!

interface GigabitEthernet1/0/5

switchport access vlan 7

switchport mode access

!

interface GigabitEthernet1/0/6

switchport access vlan 7

switchport mode access

!

interface GigabitEthernet1/0/7

switchport access vlan 7

!

interface GigabitEthernet1/0/8

switchport access vlan 7

!

interface GigabitEthernet1/0/9

switchport access vlan 2

!

interface GigabitEthernet1/0/10

description RemusSQL_Lan

switchport access vlan 17

!

interface GigabitEthernet1/0/11

switchport mode access

!

interface GigabitEthernet1/0/12

switchport trunk encapsulation dot1q

switchport mode access

!

interface GigabitEthernet1/0/13

!

interface GigabitEthernet1/0/14

!

interface GigabitEthernet1/0/15

switchport access vlan 6

!

interface GigabitEthernet1/0/16

switchport mode access

!

interface GigabitEthernet1/0/17

description Romulus_Lan

switchport access vlan 17

!

interface GigabitEthernet1/0/18

!

interface GigabitEthernet1/0/19

description Cleito_ILO

!

interface GigabitEthernet1/0/20

!

interface GigabitEthernet1/0/21

!

interface GigabitEthernet1/0/22

!

interface GigabitEthernet1/0/23

description From Firewall

switchport mode access

!

interface GigabitEthernet1/0/24

description Trunk to Swich 2

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 1 mode active

!

interface Vlan1

ip address 172.18.6.14 255.255.255.0

no ip route-cache

!

interface Vlan6

ip address 192.168.216.2 255.255.255.0

!

interface Vlan7

ip address 192.168.217.2 255.255.255.0

!

interface Vlan17

ip address 192.168.215.2 255.255.255.0

!

ip default-gateway 172.18.6.16

ip classless

ip http server

!

!

control-plane

!

!

line con 0

!

end

**********************************************************************

SWITCH5

**********************************************************************

SW5#sh run          

Building configuration...

Current configuration : 5534 bytes

!

version 12.2

no service pad

service timestamps debug uptime

service timestamps log datetime localtime

no service password-encryption

!

hostname SW5

!

enable secret xxxxxxxxxxxx

!

no aaa new-model

clock timezone UTC -6

clock summer-time UTC recurring

switch 1 provision ws-c3750g-24t

system mtu routing 1500

ip subnet-zero

ip routing

!

!

no file verify auto

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

interface Port-channel1

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel2

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel3

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel4

switchport trunk encapsulation dot1q

switchport mode access

!

interface GigabitEthernet1/0/1

description etherchanne to SW4

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 3 mode active

!

interface GigabitEthernet1/0/2

description etherchanne to SW4

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 3 mode active

!

interface GigabitEthernet1/0/3

description EMC_Standby cge1

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 2 mode active

!

interface GigabitEthernet1/0/4

description EMC_Standby cge2

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 2 mode active

!

interface GigabitEthernet1/0/5

description EMC_Data1 cge0 - Active (Server_2)

switchport access vlan 6

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/6

description EMC_Data1 cge0 - Active (Server_3)

switchport access vlan 6

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/7

description EMC_Data1 RemusSQL (Teamed)

switchport access vlan 6

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/8

description EMC_Data1 RemusSQL (Teamed)

switchport access vlan 6

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/9

description EMC_Cifs

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/10

description RemusSQL_Lan

switchport access vlan 17

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/11

description EMC_Cifs

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/12

description EMC_Backup Cleito (to be configured)

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/13

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/14

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/15

description Cleito

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/16

description Cleito

switchport access vlan 7

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/17

description Romulus_Lan

switchport access vlan 17

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/18

switchport trunk encapsulation dot1q

switchport mode access

channel-group 4 mode active

spanning-tree portfast

!

interface GigabitEthernet1/0/19

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/20

switchport trunk encapsulation dot1q

switchport mode access

channel-group 4 mode active

spanning-tree portfast

!

interface GigabitEthernet1/0/21

description EMC Management Port

switchport access vlan 17

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/22

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/23

description Despina

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/24

switchport mode access

spanning-tree portfast

!

interface Vlan1

ip address 172.18.6.16 255.255.255.0

!

interface Vlan2

ip address 192.168.218.1 255.255.255.0

!

interface Vlan3

ip address 192.168.219.1 255.255.255.0

!

interface Vlan4

ip address 192.168.220.1 255.255.255.0

!

interface Vlan5

ip address 192.168.221.1 255.255.255.0

!

interface Vlan6

ip address 192.168.216.1 255.255.255.0

!

interface Vlan7

ip address 192.168.217.1 255.255.255.0

!

interface Vlan12

ip address 192.168.224.1 255.255.255.0

!

interface Vlan15

ip address 192.168.227.1 255.255.255.0

!

interface Vlan17

ip address 192.168.215.1 255.255.255.0

!

interface Vlan900

ip address 10.11.6.1 255.255.255.0

!

ip default-gateway 172.18.6.1

ip classless

ip route 0.0.0.0 0.0.0.0 172.18.6.1

ip route 10.0.0.0 255.0.0.0 172.18.6.2

ip route 172.16.0.0 255.248.0.0 172.18.6.2

ip route 192.168.0.0 255.255.0.0 172.18.6.2

ip http server

!

ip access-list extended wireless

deny   ip 10.11.6.0 0.0.0.255 172.18.0.0 0.0.255.255

deny   ip 10.11.6.0 0.0.0.255 192.168.0.0 0.0.255.255

permit ip 10.11.6.0 0.0.0.255 any

!        

access-list 5 permit 172.18.120.0 0.0.0.255

!

control-plane

!

!

!

end

New Member

LAN Mess

Hi Adam, I forgot to mention Switch models....they are both WS-C3750G-24T

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