Comments on: Cisco Router-on-a-stick with Switch http://www.networkstraining.com/cisco-router-on-a-stick-with-switch/ IP Networks Training and Tutorials Tue, 07 Feb 2012 15:03:08 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Blog Admin http://www.networkstraining.com/cisco-router-on-a-stick-with-switch/comment-page-1/#comment-2266 Blog Admin Mon, 08 Aug 2011 06:12:11 +0000 http://www.networkstraining.com/?p=77#comment-2266 John, Good questions. 1) you can put as vlanid 1 and put the keyword "native vlan" 2) from what I know, you can not have dot1q and isl on the same trunk port. In any case, ISL is not used any more by Cisco. John,

Good questions.

1) you can put as vlanid 1 and put the keyword “native vlan”
2) from what I know, you can not have dot1q and isl on the same trunk port. In any case, ISL is not used any more by Cisco.

]]> By: john http://www.networkstraining.com/cisco-router-on-a-stick-with-switch/comment-page-1/#comment-2263 john Thu, 04 Aug 2011 02:09:59 +0000 http://www.networkstraining.com/?p=77#comment-2263 hi, i have 2 doubts: 1. let's say there are 3 vlans- vlan 1,2,3. now my trunk link connecting the switch and the router uses dot1q. now on the router i configure 2 sub-interfaces- one using dot1q 2 and the other using dot1q 3. the traffic belonging to vlan 1 will be sent by the switch to the router without any tag. so will the physical interface of the router deal with that untagged frame (and hence will i have to assign an ip to the physical interface of the router) or will i have to create a sub-interface for vlan 1 as well? and if i'll have to create a subinterface for vlan 1 then what will be my vlan id in the encapsulation dot1q statement cuz that frame would be without any vlan tag. doubt 2 : let's say i configure a sub-interface of a router with the statement - "encap dot1q 2". now can i configure another statement as - "encap isl 3"? (i know it's a stupid question but i am still curious to know). any help will be highly appreciated. thanks. john. hi, i have 2 doubts:
1. let’s say there are 3 vlans- vlan 1,2,3. now my trunk link connecting the switch and the router uses dot1q. now on the router i configure 2 sub-interfaces- one using dot1q 2 and the other using dot1q 3. the traffic belonging to vlan 1 will be sent by the switch to the router without any tag. so will the physical interface of the router deal with that untagged frame (and hence will i have to assign an ip to the physical interface of the router) or will i have to create a sub-interface for vlan 1 as well? and if i’ll have to create a subinterface for vlan 1 then what will be my vlan id in the encapsulation dot1q statement cuz that frame would be without any vlan tag.
doubt 2 : let’s say i configure a sub-interface of a router with the statement – “encap dot1q 2″. now can i configure another statement as – “encap isl 3″? (i know it’s a stupid question but i am still curious to know). any help will be highly appreciated.
thanks.
john.

]]> By: Blog Admin http://www.networkstraining.com/cisco-router-on-a-stick-with-switch/comment-page-1/#comment-2021 Blog Admin Wed, 30 Mar 2011 15:59:15 +0000 http://www.networkstraining.com/?p=77#comment-2021 Eddie, He means 802.1q....it was a typo Eddie,

He means 802.1q….it was a typo

]]> By: Eddie http://www.networkstraining.com/cisco-router-on-a-stick-with-switch/comment-page-1/#comment-2014 Eddie Wed, 30 Mar 2011 01:37:35 +0000 http://www.networkstraining.com/?p=77#comment-2014 Warren, What is 203.1q? Don't you mean 802.1q? ...or am I missing something? Warren, What is 203.1q? Don’t you mean 802.1q? …or am I missing something?

]]> By: Blog Admin http://www.networkstraining.com/cisco-router-on-a-stick-with-switch/comment-page-1/#comment-783 Blog Admin Wed, 27 Oct 2010 04:43:45 +0000 http://www.networkstraining.com/?p=77#comment-783 Hi Sean, There is command under the interface configuration with which you specify the native vlan. I think the command is "<strong>switchport trunk native vlan 2</strong>" Hi Sean,

There is command under the interface configuration with which you specify the native vlan. I think the command is “switchport trunk native vlan 2“

]]> By: Sean http://www.networkstraining.com/cisco-router-on-a-stick-with-switch/comment-page-1/#comment-781 Sean Wed, 27 Oct 2010 03:02:38 +0000 http://www.networkstraining.com/?p=77#comment-781 So what about the native vlan on the interface that is trunking to the router? meaning, what if I want the native vlan to be 2 or 3 instead of the default 1? So what about the native vlan on the interface that is trunking to the router? meaning, what if I want the native vlan to be 2 or 3 instead of the default 1?

]]> By: Blog Admin http://www.networkstraining.com/cisco-router-on-a-stick-with-switch/comment-page-1/#comment-731 Blog Admin Wed, 13 Oct 2010 05:22:03 +0000 http://www.networkstraining.com/?p=77#comment-731 The default gateway on the router must be assigned as following: ip route 0.0.0.0 0.0.0.0 172.12.2.1 Remove RIP and put the above command and should work. The default gateway on the router must be assigned as following:

ip route 0.0.0.0 0.0.0.0 172.12.2.1

Remove RIP and put the above command and should work.

]]> By: R Bacca http://www.networkstraining.com/cisco-router-on-a-stick-with-switch/comment-page-1/#comment-729 R Bacca Wed, 13 Oct 2010 00:18:05 +0000 http://www.networkstraining.com/?p=77#comment-729 Hi, I just did the router-on-a-stick lab and works well with two PCs as hosts. But I couldn't make work using two routers acting as hosts, as instructed I added the default gateway to the routers but no luck (the only way that I could make it work was by running rip an all 3 routers..But I think I can do it without running rip.. I just don't know how any help would be appreciated ) This is the config on the router PC2#show run Building configuration... Current configuration : 819 bytes version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption hostname PC2 boot-start-marker boot-end-marker memory-size iomem 15 no network-clock-participate slot 1 no network-clock-participate wic 0 no aaa new-model ip subnet-zero ip cef !no ip domain lookup ip audit po max-events 100 ! interface FastEthernet0/0 ip address 172.12.2.2 255.255.255.0 duplex auto speed auto ! router rip version 2 network 172.12.0.0 ! ip default-gateway 172.12.2.1 ip http server no ip http secure-server ip classless line con 0 line aux 0 line vty 0 4 ! ! end Hi,
I just did the router-on-a-stick lab and works well with two PCs as hosts.
But I couldn’t make work using two routers acting as hosts, as instructed I added the default gateway to the routers but no luck (the only way that I could make it work was by running rip an all 3 routers..But I think I can do it without running rip.. I just don’t know how any help would be appreciated )

This is the config on the router

PC2#show run
Building configuration…
Current configuration : 819 bytes
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname PC2
boot-start-marker
boot-end-marker
memory-size iomem 15
no network-clock-participate slot 1
no network-clock-participate wic 0
no aaa new-model
ip subnet-zero
ip cef
!no ip domain lookup
ip audit po max-events 100
!
interface FastEthernet0/0
ip address 172.12.2.2 255.255.255.0
duplex auto
speed auto
!
router rip
version 2
network 172.12.0.0
!
ip default-gateway 172.12.2.1
ip http server
no ip http secure-server
ip classless
line con 0
line aux 0
line vty 0 4
!
!
end

]]> By: Blog Admin http://www.networkstraining.com/cisco-router-on-a-stick-with-switch/comment-page-1/#comment-597 Blog Admin Wed, 25 Aug 2010 04:58:03 +0000 http://www.networkstraining.com/?p=77#comment-597 Yeap, Warren is right. I haven't played much with 2960 switches but seems they support only 802.1q as Vlan protocol, so you just need to specify "<strong>switchport mode trunk</strong>" only in your configuration. Yeap, Warren is right. I haven’t played much with 2960 switches but seems they support only 802.1q as Vlan protocol, so you just need to specify “switchport mode trunk” only in your configuration.

]]> By: Warren Sullivan http://www.networkstraining.com/cisco-router-on-a-stick-with-switch/comment-page-1/#comment-596 Warren Sullivan Wed, 25 Aug 2010 03:30:26 +0000 http://www.networkstraining.com/?p=77#comment-596 Jack, You only have to enter the command: (config-if)# switchport trunk encapsulation dot1q if your switch supports 203.1q AND ISL (ISL is an old school cisco proprietry protocol) If the option isnt there, it only supports 203.1q so there is no need to specify 203.1q, just skip the line....as in: # conf t (config)# vlan database (config-vlan)# vlan 10 name RED (config-vlan)# vlan 20 name GREEN (config-vlan)# exit (config)# interface FastEthernet1/0/1 (config-if)# description trunk-to-router-on-a-stick (config-if)# switchport mode trunk (config-if)# exit (config)# interface FastEthernet1/0/2 (config-if)# description connection-to-RED-VLAN (config-if)# switchport mode access (config-if)# switchport access vlan 10 (config-if)# exit (config)# interface FastEthernet1/0/3 (config-if)# description connection-to-GREEN-VLAN (config-if)# switchport mode access (config-if)# switchport access vlan 20 (config-if)# exit (config)# exit # copy run start Jack,
You only have to enter the command:
(config-if)# switchport trunk encapsulation dot1q
if your switch supports 203.1q AND ISL (ISL is an old school cisco proprietry protocol)
If the option isnt there, it only supports 203.1q so there is no need to specify 203.1q, just skip the line….as in:
# conf t
(config)# vlan database
(config-vlan)# vlan 10 name RED
(config-vlan)# vlan 20 name GREEN
(config-vlan)# exit
(config)# interface FastEthernet1/0/1
(config-if)# description trunk-to-router-on-a-stick
(config-if)# switchport mode trunk
(config-if)# exit
(config)# interface FastEthernet1/0/2
(config-if)# description connection-to-RED-VLAN
(config-if)# switchport mode access
(config-if)# switchport access vlan 10
(config-if)# exit
(config)# interface FastEthernet1/0/3
(config-if)# description connection-to-GREEN-VLAN
(config-if)# switchport mode access
(config-if)# switchport access vlan 20
(config-if)# exit
(config)# exit
# copy run start

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