VLAN and TRUNK on a c2960

Apr 12, 2006 6 Replies
B

I need to configure a switch with VLAN ports and a few Trunk ports. It seems to work but I am a little unsure about the configuration. Have I missed something? Please se the configuration below:


! version 12.2 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname cisco-sw ! enable secret 5 $1$WDrd$c9BBVIwpRdiVOxQSnsEEM/ ! no aaa new-model clock timezone UTC 1 clock summer-time UTC recurring last Sun Mar 2:00 last Sun Oct 3:00 ip subnet-zero ! ! ! ! no file verify auto spanning-tree mode pvst spanning-tree extend system-id ! vlan internal allocation policy ascending ! interface FastEthernet0/1 switchport access vlan 2 switchport mode access ! interface FastEthernet0/2 switchport access vlan 2 switchport mode access ! interface FastEthernet0/3 switchport access vlan 2 switchport mode access ! interface FastEthernet0/4 switchport access vlan 2 switchport mode access ! interface FastEthernet0/5 switchport access vlan 2 switchport mode access ! interface FastEthernet0/6 switchport access vlan 2 switchport mode access ! interface FastEthernet0/7 switchport access vlan 3 switchport mode access ! interface FastEthernet0/8 switchport access vlan 3 switchport mode access ! interface FastEthernet0/9 switchport access vlan 3 switchport mode access ! interface FastEthernet0/10 switchport access vlan 3 switchport mode access ! interface FastEthernet0/11 switchport access vlan 3 switchport mode access ! interface FastEthernet0/12 switchport access vlan 3 switchport mode access ! interface FastEthernet0/13 description Trunk1 switchport trunk native vlan 4 switchport trunk allowed vlan 2-4 switchport mode trunk switchport nonegotiate ! interface FastEthernet0/14 description Trunk1 switchport trunk native vlan 4 switchport trunk allowed vlan 2-4 switchport mode trunk switchport nonegotiate ! interface FastEthernet0/15 description Trunk1 switchport trunk native vlan 4 switchport trunk allowed vlan 2-4 switchport mode trunk switchport nonegotiate ! interface FastEthernet0/16 description Trunk1 switchport trunk native vlan 4 switchport trunk allowed vlan 2-4 switchport mode trunk switchport nonegotiate ! interface FastEthernet0/17 ! interface FastEthernet0/18 ! interface FastEthernet0/19 ! interface FastEthernet0/20 ! interface FastEthernet0/21 ! interface FastEthernet0/22 ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface FastEthernet0/25 ! interface FastEthernet0/26 ! interface FastEthernet0/27 ! interface FastEthernet0/28 ! interface FastEthernet0/29 ! interface FastEthernet0/30 ! interface FastEthernet0/31 ! interface FastEthernet0/32 ! interface FastEthernet0/33 ! interface FastEthernet0/34 ! interface FastEthernet0/35 ! interface FastEthernet0/36 ! interface FastEthernet0/37 ! interface FastEthernet0/38 ! interface FastEthernet0/39 ! interface FastEthernet0/40 ! interface FastEthernet0/41 ! interface FastEthernet0/42 ! interface FastEthernet0/43 ! interface FastEthernet0/44 ! interface FastEthernet0/45 switchport mode access ! interface FastEthernet0/46 switchport mode access ! interface FastEthernet0/47 switchport mode access ! interface FastEthernet0/48 description Admin InterFace switchport mode access ! interface GigabitEthernet0/1 ! interface GigabitEthernet0/2 ! interface Vlan1 ip address 192.168.1.50 255.255.255.0 no ip route-cache ! interface Vlan2 no ip address no ip route-cache ! ip default-gateway 10.0.0.1 ip http server ! control-plane ! ! line con 0 line vty 0 4 password pass login line vty 5 15 password PASS login ! ! end


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D

I would add the "switchport trunk encap dot1q" command to these ports a well. Everything else looks good

-- dal

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B

This is all I can choose:

cisco-sw(config-if)#switchport trunk ? allowed Set allowed VLAN characteristics when interface is in runking mode native Set trunking native characteristics when interface is in trunking mode pruning Set pruning VLAN characteristics when interface is in trunking mode

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H

Hello,

the configuration looks ok, except for the access ports, which should be configured with ' spanning-tree portfast' in order to prevent problems with machines getting access to the network (e.g. DHCP might time out if this is not configured):

interface FastEthernet0/9 switchport access vlan 3 switchport mode access

--> spanning-tree portfast

HTH,

GNT

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B

and in addition to this it's good configure bpduguard to avoid spanning-tree if another switch gets connected ...

snanning-tree bpduguard enable

BernieM

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9

Also, if some or all of your trunked interfaces are going to the same switch, you should consider implementing etherchannel on the trunks going to the same remote switch to group them into one logical link.

Scott

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B

Yes some of my trunks are going to the same host... What is etherchanal and do I have to use cisco in the other end?

By the way, thank you all for your replys!

Regards Martin

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