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Month: July 2009

CISCO WS-C2960G-8TC-L

Well the new switch just arrived here are some pics. Looks quite nice, little bit bigger than your usual 8 port switch, but it runs nice and quiet 🙂

When it came to configuring individual ports, following website prooved very useful:
http://www.itsyourip.com/cisco/how-to-enable-spanning-tree-portfast-in-cisco-catalyst-switch-ios/

With gigabit connectivity you can enable jumbo ports in global config:

system mtu jumbo 9000

Then by issuing “show system mtu”

System MTU size is 1500 bytes
System Jumbo MTU size is 9000 bytes
Routing MTU size is 1500 bytes

Also note on Port GigabitEthernet 0/6 i decided not to use the portfast/bpduguard since the Cisco 877 is plugged into it, and that has a switch. Portfast is only recommended on single devices etc.

Current config I have running:

Current configuration : 3531 bytes
!
version 12.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname 2960G
!
boot-start-marker
boot-end-marker
!
enable secret yourpasshere
!
no aaa new-model
system mtu routing 1500
ip subnet-zero
!
!
!
!
spanning-tree mode pvst
spanning-tree etherchannel guard misconfig
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
!
!
interface GigabitEthernet0/1
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
!
interface GigabitEthernet0/2
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
!
interface GigabitEthernet0/3
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
!
interface GigabitEthernet0/4
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
!
interface GigabitEthernet0/5
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
!
interface GigabitEthernet0/6
switchport mode access
!
interface GigabitEthernet0/7
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
!

interface GigabitEthernet0/8
switchport mode access
spanning-tree portfast
spanning-tree bpduguard enable
!
interface Vlan1
ip address 10.108.1.9 255.255.255.224
no ip route-cache
control-plane
!
!
line con 0
login

line vty 0 4
access-class 102 in
login
line vty 5 15
no login
!
end

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Ordered CISCO WS-C2960G-8TC-L

Well i just ordered a new cisco switch – CISCO WS-C2960G-8TC-L

To be used for home purposes of course and experimenting 🙂 So far I have the 877 as the ADSL type modem, also got a Cisco Pix501 used as a firewall for a wireless network I connect into, and im just missing a cisco switch now 🙂

I also have to one day write a small writeup on how a pix501 can be configured in between networks.

When i get the 2960G will post photos/config etc 🙂

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Setting up Cisco 877 with an external modem

Need to setup a 877 with an external ADSL modem in bridged mode? Maybe you have another modem which can sync/be more stable than the cisco and you wish to purely use the 877 as a router.

Following commands should help set it up..

Assign an ethernet interface to where it will use pppoe from, and assign it vlan2

interface FastEthernet3
description External DSL PPPoE
switchport access vlan 2

interface Vlan2
description External DSL PPPoE
no ip address
pppoe enable group global
pppoe-client dial-pool-number 2

setup a Dialer2 interface..

!
interface Dialer2
description connection to External DSL modem
ip address negotiated
ip access-group 101 in
no ip unreachables
ip nat outside
no ip virtual-reassembly
encapsulation ppp
ip tcp adjust-mss 1410
dialer pool 2
dialer idle-timeout 0
dialer-group 2
no cdp enable
ppp authentication chap callin
ppp chap hostname [email protected]
ppp chap password something

ip route 0.0.0.0 0.0.0.0 Dialer2

ip nat inside source list 102 interface Dialer2 overload

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