Anyone here got a clue about cisco networking?

Started by mrapoc, Nov 08, 2010, 22:16:33

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mrapoc

Just need to ask a few questions about my packet tracer assignment

Got all green lights but some packet loss/connection issues  :)

Lance

Mitch might know a bit and I'm sure he will see this thread.
Lance
_____

This post reflects my own views, opinions and experience, not those of IDNet.

pctech

Just to let you know I've seen it and will respond properly in the morning before I head to work when I can think straight.

I'm off to get some grub and sleep.


Lance

Lance
_____

This post reflects my own views, opinions and experience, not those of IDNet.

mrapoc


Rik

Quote from: Lance on Nov 08, 2010, 22:50:38
You see, I told you he would!!

;D

We're good at the prediction lark aren't we. ;)
Rik
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This post reflects my own views, opinions and experience, not those of IDNet.

pctech

Ok later than intended but here goes.

What type of connection are you experiencing loss over? (one of the local LAN links or a serial WAN connection)?

Have you ensured both ends are in the up state (no shutdown issued on both ports)

If using RIP or RIP v2 as your routing protocol make sure your timers are in sync.

If using OSPF make sure the AS number is the same on both ends to ensure they achieve adjacency.

Hopefully thats enough to prompt you but if you can give me a little more info I maybe able to help a little more.

mrapoc

Well it seems I can ping from one pc on a vlan to other pcs on the equivalent vlan

I can ping from router to router over the serial connection

Switch to switch seems to have problems

Switch to PC seems to have problems

Switch to router seems to have problems

Using OSPF and Dot1q trunking

I'll post up my packet tracer layout in a bit - is there anything that springs to mind?


nfx_

Just stumbled across this as I currently have no Internet, have you setup a native vlan on the swtich and assigned an IP address to it?

mrapoc

Yes

Assigned native to 1 and gave it ip 172.16.1.2 / .3 for each switch

Does any one have packet tracer?

If so I can post up the file

If not ill post up my setup and any relevant config files worth looking at

...Tomorrow that is :)

nn

nfx_

I have packet tracer I should be able to have a look tomorrow.

Steve

Steve
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This post reflects my own views, opinions and experience, not those of IDNet.

Rik

Rik
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This post reflects my own views, opinions and experience, not those of IDNet.

zappaDPJ

zap
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This post reflects my own views, opinions and experience, not those of IDNet.

Ray

Ray
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This post reflects my own views, opinions and experience, not those of IDNet.

mrapoc

Attached Packet tracer

I dont necessarily want a direct answer, more what I should check as its been racking my brain, just need to figure it out  :evil:

Thanks and welcome to idnetters !

mrapoc

Is it there...I attached it but couldnt see it before  :blush:

Ahh yes

Attached below  :laugh:

nfx_

#17
I've had a look, it looked as you hadn't setup the native vlan correctly on switches and router, below I have shown the config you had originally and what I have changed it to.

Switch1
interface FastEthernet0/1
switchport trunk allowed vlan 1,10,20
switchport mode trunk
!
interface FastEthernet0/2
switchport trunk allowed vlan 1,10,20
switchport mode trunk

New Config
interface FastEthernet0/1
switchport mode trunk
switchport trunk native vlan 1
!
interface FastEthernet0/2
switchport mode trunk
switchport trunk native vlan 1
!

Switch 2
interface FastEthernet0/1
switchport trunk allowed vlan 1-1001
switchport mode trunk
!

New Config
interface FastEthernet0/1
switchport mode trunk
switchport trunk native vlan 1
!

On the router you had used the native command but it was on the wrong interface so I just switched to the correct interface and everything appears to be working correctly now.

StaffordRouter
interface FastEthernet0/0.1
encapsulation dot1Q 1
ip address 172.16.1.1 255.255.255.0
!
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip address 172.16.10.1 255.255.255.0
!
interface FastEthernet0/0.20
encapsulation dot1Q 20 native
ip address 172.16.20.1 255.255.255.0
!

New Config
interface FastEthernet0/0.1
encapsulation dot1Q 1 native
ip address 172.16.1.1 255.255.255.0
!
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip address 172.16.10.1 255.255.255.0
!
interface FastEthernet0/0.20
encapsulation dot1Q 20
ip address 172.16.20.1 255.255.255.0
!

The thing to remember is that the native vlan needs to be consistent across all switches and routers, hope this helps and hasn't just confused you further.

Steve

Well it looks impressive, I hope it works :karma:
Steve
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This post reflects my own views, opinions and experience, not those of IDNet.

nfx_

I'm by no means an expert I only completed my CCNA at the start of this year, there are probably people here that will be able to explain it better than I have.

mrapoc

Looking at it at work at the moment. Thanks for taking a look :) ever grateful :) i'l have a pop tonight but that does make sense. Quite proud thats all i had wrong lol :) karma for you when i get hmme

mrapoc

Ah i understand the router native cmd now. Had to set it native on the 0.01 as that was vlan 1 the native id !

pctech

I have to say I had to back out of the CCNA due to work commitments before I got to VLANs so can't really give you an answer I'm afraid.

mrapoc

I cant seem to be able to ping a switch from a connected device

Is this normal?

pctech