sf 300

[mrsystemengineer]

Dear's friend

        I have struck in my some network configuration.  I have two sf300 switches and cisco 827 router.  Actually sf300 does not support dhcp server.  I took cisco 827 as dhcp server and i create 4 dhcp pools in it.

How i can configure in sf300 to take dhcp service from cisco router 827.  Isit possible to configure 827 with bvi interface, when i was try i got below error.  Can anyone help me to configure bvi interface and i will link that bvi to vlan on sf300.

error in 827 router

Router(config-subif)#bridge-group 1

Bridging on a LAN  subinterface requires that the interface be already
configured for Inter Switch Link (ISL) encapsulation or 802.1Q encapsulation

sf300 Configuration:

Int vlan 1

ip address 192.168.1.1 255.255.255.0

int vlan 2

ip address 192.168.2.1 255.255.255.0

int vlan 3

ip address 192.168.3.1 255.255.255.0

int vlan 4

ip address 192.168.4.1 255.255.255.0

How i can connect two sf300 switch for redundancy ?  I connected giga4 SW1 and giga4 SW2 and mode trunk isit good or any other way i need to connect it.?

thanks in advance.

[Tom Watts]

Hi mr, the error sounds like you did not create a sub interface and if you did, you did not specify the 802.1q toggle. The SF300 supports only 802.1q. When specifying the dhcp pool you also need to specify the default-router.

Additionally, I see you configured the SF300 in layer 3 mode. If your 827 is supporting the sub interfaces, the inter vlan communication can take place at the router otherwise the DHCP from the 827 would need to provide the SVI of the switch as default gateways to allow the switch to handle the intervlan communication.

For redundant connections you may basically do as you like. Spanning tree will block one port which is not a bad thing.

-Tom
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[mrsystemengineer]

Tom still i have same problem.

See the below configuration of my switch

=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2013.02.18 19:31:07 =~=~=~=~=~=~=~=~=~=~=~=

sh r

SW2(config)#$                                                 sh run

% Unrecognized command

SW2(config)#do sh run

config-file-header

SW2

v1.2.7.76 / R750_NIK_1_2_584_002

CLI v1.0

file SSD indicator encrypted

@

ssd-control-start

ssd config

ssd file passphrase control unrestricted

no ssd file integrity control

ssd-control-end cb0a3fdb1f3a1af4e4430033719968c0

!

vlan database

vlan 2-7

exit

voice vlan id 5

voice vlan oui-table add 0001e3 Siemens_AG_phone________

voice vlan oui-table add 00036b Cisco_phone_____________

voice vlan oui-table add 00096e Avaya___________________

voice vlan oui-table add 000fe2 H3C_Aolynk______________

voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone

voice vlan oui-table add 00d01e Pingtel_phone___________

More: ,  Quit: q or CTRL+Z, One line:

voice vlan oui-table add 00e075 Polycom/Veritel_phone___

voice vlan oui-table add 00e0bb 3Com_phone______________

ip dhcp relay address 10.1.6.252

ip dhcp relay enable

ip dhcp information option

bonjour interface range vlan 1

hostname SW2

!

interface vlan 1

no ip address dhcp

!

interface vlan 2

name " VLAN_2"

ip address 10.1.2.1 255.255.255.0

ip dhcp relay enable

!

interface vlan 3

name "VLAN_3"

ip address 10.1.3.1 255.255.255.0

ip dhcp relay enable                                                     

!

interface vlan 4

name "VLAN_4"

ip address 10.1.4.1 255.255.255.0

ip dhcp relay enable

!

interface vlan 5

name "IP Telephony VLAN"

ip address 10.1.5.1 255.255.255.0

ip dhcp relay enable

!

interface vlan 6

name "Switches VLAN"

ip address 10.1.6.1 255.255.255.0

ip dhcp relay enable

!

interface vlan 7

name "Master VLAN"

ip address 10.1.7.1 255.255.255.0

ip dhcp relay enable

!

interface fastethernet1                                                  

switchport mode access

!

interface fastethernet2

switchport mode access

!

interface fastethernet3

switchport mode access

!

interface fastethernet4

switchport mode access

!

interface fastethernet5

switchport mode access

!

interface fastethernet6

switchport mode access

!

interface fastethernet7

switchport mode access

!

interface fastethernet8

switchport mode access                                                    

!

interface fastethernet9

switchport mode access

switchport access vlan 2

!

interface fastethernet10

switchport mode access

switchport access vlan 2

!

interface fastethernet11

switchport mode access

switchport access vlan 2

!

interface fastethernet12

switchport mode access

switchport access vlan 2

!

interface fastethernet13

switchport mode access

switchport access vlan 2

!

interface fastethernet14                                                    

switchport mode access

switchport access vlan 3

!

interface fastethernet15

switchport mode access

switchport access vlan 3

!

interface fastethernet16

switchport mode access

switchport access vlan 3

!

interface fastethernet17

switchport mode access

switchport access vlan 3

!

interface fastethernet18

switchport mode access

switchport access vlan 4

!

interface fastethernet19

switchport mode access

switchport access vlan 4                                                     

!

interface fastethernet20

switchport mode access

switchport access vlan 4

!

interface fastethernet21

switchport mode access

switchport access vlan 4

!

interface fastethernet22

switchport mode access

switchport access vlan 4

!

interface fastethernet23

switchport mode access

switchport access vlan 4

!

interface fastethernet24

switchport mode access

switchport access vlan 4

!

interface fastethernet25

switchport mode access

switchport access vlan 4

!

interface fastethernet26

switchport mode access

switchport access vlan 4

!

interface fastethernet27

switchport mode access

switchport access vlan 4

!

interface fastethernet28

switchport mode access

switchport access vlan 5

!

interface fastethernet29

switchport mode access

switchport access vlan 5

!

interface fastethernet30

switchport mode access

switchport access vlan 5                                                    

!

interface fastethernet31

switchport mode access

switchport access vlan 5

!

interface fastethernet32

switchport mode access

switchport access vlan 5

!

interface fastethernet33

switchport mode access

switchport access vlan 5

!

interface fastethernet34

switchport mode access

switchport access vlan 5

!

interface fastethernet35

switchport mode access

switchport access vlan 5

!

interface fastethernet36                                                     

switchport mode access

switchport access vlan 5

!

interface fastethernet37

switchport mode access

switchport access vlan 5

!

interface fastethernet38

switchport mode access

switchport access vlan 5

!

interface fastethernet39

switchport mode access

switchport access vlan 5

!

interface fastethernet40

switchport mode access

switchport access vlan 5

!

interface fastethernet41

switchport mode access

switchport access vlan 5                                                     

!

interface fastethernet42

switchport mode access

switchport access vlan 5

!

interface fastethernet43

switchport mode access

switchport access vlan 5

!

interface fastethernet44

switchport mode access

switchport access vlan 5

!

interface fastethernet45

switchport mode access

switchport access vlan 5

!

interface fastethernet46

switchport mode access

switchport access vlan 5

!

interface fastethernet47                                                     

switchport mode access

switchport access vlan 7

!

interface fastethernet48

switchport mode access

switchport access vlan 6

!

interface gigabitethernet4

switchport trunk allowed vlan add 2-7

Description Connection To SW1

!

SW2(config)#                                                                

[Tom Watts · Accepted solution]

Hi MR,

You need to have the DHCP relay configured correctly

configure terminal

ip dhcp relay enable

ip dhcp relay address (address of the DHCP server)

ip dhcp information option  (option 82)

interface gi4

ip dhcp relay enable

The rest of your config looks fine for the switch.

-Tom
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