Cisco

I have already make tiny lab with xconnect, but my curiosity has been recently exacerbated so that I can see exactly how it works…

 

 

 

 

 

 

 

 

 

What occurs behind the scene when you press ENTER (the reflexive command has already been pushed on R4) ?

R6(config-if)# xconnect 4.4.4.4 1111 encapsulation mpls

 

You can see on R4 :

R4#debug mpls ldp targeted-neighbors
LDP Directed Adjacency changes debugging is on
R4#debug mpls ldp transport connections 
LDP transport connection events debugging is on
R4#debug mpls ldp transport events 
LDP transport events debugging is on
[...]
*Aug 17 22:22:17.663: ldp: Peer LDP Id set to 6.6.6.6:0 for trgt 6.6.6.6, lcl addr = 4.4.4.4
*Aug 17 22:22:17.667: ldp: Rcvd ldp dir hello to 4.4.4.4 from 6.6.6.6 (6.6.6.6:0); FastEthernet0/1; opt 0xF
*Aug 17 22:22:17.671: ldp: ldp Hello from 6.6.6.6 (6.6.6.6:0) to 4.4.4.4, opt 0xF
*Aug 17 22:22:17.671: ldp: New directed adjacency 0x67A32E68 to 4.4.4.4 from 6.6.6.6 (6.6.6.6:0)
*Aug 17 22:22:17.675: ldp: Immediately request dhcb send hello back from 4.4.4.4 to 6.6.6.6
*Aug 17 22:22:17.675: ldp: local idb = targeted, holdtime = 90000, peer 6.6.6.6 holdtime = 90000
*Aug 17 22:22:17.675: ldp: dhcb intvl mbr cnt = 1, intvl = 10000, target = 6.6.6.6
*Aug 17 22:22:17.679: ldp: Opening listen port 646 for 6.6.6.6, 6.6.6.6
*Aug 17 22:22:17.683: ldp: No MD5 password protection for peer 6.6.6.6:0
*Aug 17 22:22:17.683: ldp: Registered TCB with LDP TCB database tcb 0x66BB49A0 [key
R4# 1779], total 2
*Aug 17 22:22:17.683: ldp: Open LDP listen TCB 0x66BB49A0; lport = 646; fhost = 6.6.6.6; with normal priority
*Aug 17 22:22:17.683: ldp: Add listen TCB to list; tcb 0x66BB49A0 [key 1779]; addr 6.6.6.6
*Aug 17 22:22:17.683: ldp: Send ldp dir hello; no idb, src/dst 4.4.4.4/6.6.6.6, inst_id 0
*Aug 17 22:22:18.027: ldp: Rcvd ldp dir hello to 4.4.4.4 from 6.6.6.6 (6.6.6.6:0); FastEthernet0/1; opt 0xF
*Aug 17 22:22:18.027: ldp: ldp Hello from 6.6.6.6 (6.6.6.6:0) to 4.4.4.4, opt 0xF
*Aug 17 22:22:18.027: ldp: local idb = targeted, holdtime = 90000, peer 6.6.6.6 holdtime = 90000
*Aug 17 22:22:18.027: ldp: dhcb intvl mbr cnt = 1, intvl = 10000, target = 6.6.6.6
*Aug 17 22:22:18.043: ldp: Registered TCB with LDP TCB database tcb 0x66BB4FDC [key 1780], total 3
*Aug 17 22:22:18.047: ldp: Incoming ldp conn 4.4.4.4:646  6.6.6.6:38742; with normal priority
*Aug 17 22:22:18.051: ldp: Found adj 0x67A32E68 for 6.6.6.6 (Hello xport addr opt)
*Aug 17 22:22:18.051: ldp: New t
R4#emporary adj 0x66BB5618 from 6.6.6.6
*Aug 17 22:22:18.055: ldp: Real adj 0x67A32E68 bound to 6.6.6.6:0, replacing temp adj 0x66BB5618
*Aug 17 22:22:18.059: ldp: Adj 0x66BB5618; state set to closed
*Aug 17 22:22:18.183: ldp: Data received!
*Aug 17 22:22:18.187: ldp: : peer 6.6.6.6:0 down reason reset to None
*Aug 17 22:22:18.187: %LDP-5-NBRCHG: LDP Neighbor 6.6.6.6:0 (2) is UP
*Aug 17 22:22:18.191: ldp-trgtnbr: 6.6.6.6 Received address addition notif start; flags 0x13
*Aug 17 22:22:18.195: ldp-trgtnbr: 6.6.6.6 Set peer start; flags 0x13
*Aug 17 22:22:18.195: ldp-trgtnbr: 6.6.6.6 Set peer finished; flags 0x1F
*Aug 17 22:22:18.195: ldp-trgtnbr: 6.6.6.6 Received address addition notif finish; flags 0x1

 

I bought refurbished MacBook Pro mid-2010. It is a good machine. I think it will be great for a CCIE dedicated laptop :)

I have begun to make a wireless link to the place where my lab will be hosted. Let’s go to host a server and cyclades TS 1000 (which I will buy on ebay) to access my networking device.

 

 

I own now :

• 2 x C2500
• 1 x 1841
• 1 x 2611
• 1 x WS-C3550SMI
• 1 x HWIC

There are a lot of stuff to buy, but it is in progress…

When your router takes so long time to learn routes, do not try to tweak too long Time your bgp router process… Think mtu ;-) it is not unique solution but it is big one ;-)

Here come the first equipements of my future CCIE lab rack. Two nice Cisco 2501 :)

How to install IOS from tarball ? No need to extract it by means of 7zip or UNIX tar command :

Router# archive tar /xtract tftp://X.X.X.X/cme-full-7.0.0.1.tar flash:

This command is your friend :)

You can find a little challenge below :

The MPLS is not working… There’s no problem on the Frame-Relay cloud (it works perfectly). But you cannot ping from R5 to R4 :(

• R4.cfg
• R5.cfg
• R6.cfg

Troubleshoot it. It is not really hard.

For those of you which configuring IPSec and have packet loss in transit… Perhaps this configuration could help :

crypto ipsec client ezvpn REGISBTP
 connect auto
 group VPN-CLIENT2 key jsdfxkqwpoe
 local-address FastEthernet0
 mode network-extension
 peer 22.22.22.22
 username ipsec1@client2.vpn password jsdfxkqwpoe
 xauth userid mode local

interface FastEthernet0
 ip address 192.168.1.36 255.255.255.0
 ip mtu 1460
 no ip route-cache cef
 ip tcp adjust-mss 1420
 duplex auto
 speed auto
 crypto ipsec client ezvpn CLIENT2
!         

interface Vlan1
 ip address 10.20.0.1 255.255.255.0
 ip mtu 1460
 ip virtual-reassembly
 ip tcp adjust-mss 1420
 crypto ipsec client ezvpn CLIENT2 inside
!         
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 192.168.1.254

The really interesting command (which resolves packet loss) is :

Hello,

I don’t know if you already have had to reply with multiple same type of attributes (with FreeRadius) such as multiple : “Frame-Route”.

You can do this with the operator ‘+=’ (when you use FreeRadius with MySQL backend).

Hope this helps…

To begin : How to calculate the ASN 4 bytes we need to configure it ?

So : ASN-decimal = 197632.

197632 % 65536 = 3

And

197632 - (65536 * 3) = 1024

Ok. Now we can configure it on a Cisco router :

router bgp XXXX

nei 197.66.55.33 remote-as 3.1024

I let you go on the configuration as always it works.

http://pteu.hd.free.fr/doku.php?id=informatique:cisco:mpls

Hope this can help. There are others categories and lot of stuff to read.