NetNotes

Getting started with MPLS, getting rid of BGP in the core

In this lab, we will do a very simple MPLS lab, to illustrate how we can have a network without BGP on the core transit routers in an AS.  Here’s how the simple network looks like:

The complete configurations are listed at the end of the post.

We will start with just 3 routers in our AS 65001:

RLeft:

Loopback0: 192.168.255.10/32  –> Management, routed in EIGRP
Loopback1: 192.168.10.1/24 –> Simulated LAN, routed in iBGP
Fa0/0: 172.16.0.1/30 –> Interconnection to RCentre0, routed in EIGRP

RCentre0:

Loopback0: 192.168.255.11/32 –> Management, routed in EIGPR
Fa0/0: 172.16.0.2/30 –> Interconnection to RLeft, routed in EIGRP
Fa0/1: 172.16.0.5/30 –> Interconnection to RRight, routed in EIGRP

RRight:

Loopback0: 192.168.255.12/32 –> Management, routed in EIGPR
Loopback1: 192.168.20.1/24 –> Simulated LAN, routed in iBGP
Fa0/0: 172.16.0.6/30 –> Interconnection to RCentre0, routed in EIGRP

We have already enabled EIGRP across our network, and we have routed only the loopbacks and interconnection subnets (to make sure we have our neighborships up). 

› Continue reading

Tags: MPLS

cable testing on a cisco 3750

Catalyst 2960, 2970, 3560/3560-E, и 3750/3750-E switches have a built-in Time-Domain Reflectometer that can be used to test cabling directly from the switchports. TDR is not supported neither on 10Gig interfaces, nor FastEthernet or SFP interfaces.

Example:

SW01#test cable-diagnostics tdr interface gigabitethernet2/1
TDR test started on interface Gi2/1

A TDR test can take a few seconds to run on an interface

Use ’show cable-diagnostics tdr’ to read the TDR results.
SW01#

SW01#sh cable-diagnostics tdr interface gig2/1
TDR test last run on: March 02 00:31:15

Interface Speed Local pair Pair length Remote pair Pair status
——— —– ———- —————— ———– ——————–
Gi2/1 100M Pair A 47 +/- 4 meters Pair A Normal
Pair B 48 +/- 4 meters Pair B Normal
Pair C 48 +/- 4 meters Pair C Open
Pair D 48 +/- 4 meters Pair D Open
SW01#

The output shows the outgoing interface, the working bandwidth of the interface, and also which local pair corresponds to which remote one, approximated length of the cabling pair, and the pair status:

• Normal;
• Open - not connected;
• Not Completed - TDR testing was unsuccessful;
• Not supported - TDR testing not supported on the interface;
• Shorted - cable short ;);

Tags: cable testing, Catalyst 3750, Switching, TDR

Port-channel note

We have the following setup of a port-channel between to Catalyst 3750s - SW1 Gi0/1 and Gi0/2, bundled in a port-channel are connected to Gi0/1 and Gi0/2 on SW2:

SW1:

interface GigabitEthernet1/0/1
description Member of PC1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,3,4
switchport mode trunk
switchport nonegotiate
channel-group 1 mode on

interface GigabitEthernet1/0/2
description Member of PC1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,3,4
switchport mode trunk
switchport nonegotiate
channel-group 1 mode on

interface Port-channel1
description to SW2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,3,4
switchport mode trunk
switchport nonegotiate

SW2:

interface GigabitEthernet1/0/1
description Member of PC1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,3,4
switchport mode trunk
switchport nonegotiate
channel-group 1 mode on

interface GigabitEthernet1/0/2
description Member of PC1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,3,4
switchport mode trunk
switchport nonegotiate
channel-group 1 mode on

interface Port-channel1
description to SW1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,3,4
switchport mode trunk
switchport nonegotiate

In order for the port-channel to form successfully, all port members need to have identical: › Continue reading

Tags: port-channel, Switching