Cisco

Hi guys and girls, I am so sorry for this long time. It was really awesome how Alpine Linux is. I have tried in my home lab to make some different ntp server on my different vm on different proxmox hypervisors. I have tried OpenNTPd. Unfortunately I was not able to make it works. My Cisco switches cry with :

.Apr 16 21:56:47.016: NTP: rcv packet from 10.20.0.3 to 10.20.0.252 on Vlan200:
.Apr 16 21:56:47.016:  leap 3, mode 2, version 3, stratum 2, ppoll 64
.Apr 16 21:56:47.016:  rtdel 0328 (12.329), rtdsp 0000 (0.000), refid 5242284F (82.66.40.79)
.Apr 16 21:56:47.016:  ref EBAA89A0.323EAFFF (21:55:12.196 CET Wed Apr 16 2025)
.Apr 16 21:56:47.016:  org EBAA89FF.049EF92D (21:56:47.018 CET Wed Apr 16 2025)
.Apr 16 21:56:47.016:  rec EBAA89FD.D3E977FF (21:56:45.827 CET Wed Apr 16 2025)
.Apr 16 21:56:47.016:  xmt EBAA89FD.D3E9C7FF (21:56:45.827 CET Wed Apr 16 2025)
.Apr 16 21:56:47.016:  inp EBAA89FF.056B27F5 (21:56:47.021 CET Wed Apr 16 2025)
.Apr 16 21:56:47.016: NTP: packet from 10.20.0.3 failed validity tests 20
.Apr 16 21:56:47.016: Peer/Server Clock unsynchronized

And :

$ whois -h whois.ripe.net POEM-RIPE55-SONG
[...]

% Information related to 'POEM-RIPE55-SONG'

poem: POEM-RIPE55-SONG
form: FORM-PROSE
descr: At his first RIPE meeting, Gary wrote this and performed at
descr: the closing plenary. It was truly awesome.
descr: http://www.youtube.com/watch?v=_y36fG2Oba0
descr:
text: A long long time ago
text: I can still remember
text: when my laptop could connect elsewhere.
text:
text: And I tell you all there was a day
text: the network card I threw away
text: had a purpose - and it worked for you and me.
text:
text: But 18 years completely wasted
text: with each address we've aggregated
text: the tables overflowing
text: the traffic just stopped flowing...
text:
text: And now we're bearing all the scars
text: and all my traceroutes showing stars.
text: The packets would travel faster in cars
text: the day the routers died.
[... continued ...]

I don’t really easily documentary to configure BFD (RFC5880 and you could read precedent blog-post : BFD : Bidirectional Forwarding Detection (RFC5880)) between IOSXE and IOSXR boxes.

Here it comes :-)

 

IOSXE : 

R0# show run | sec bfd 
bfd fast-timers-on-slow-interface
bfd-template single-hop BFD
   interval min-tx 200 min-rx 200 multiplier 3
[...]
R0#show run int port-ch 14
Building configuration...

Current configuration : 373 bytes
!
interface Port-channel14
description *** Vers R1_Be10000 ***
mtu 9202
ip address 172.18.255.29 255.255.255.252
ip ospf authentication message-digest
ip ospf message-digest-key 10 md5 7 XXXXXXXXXXXXXXXXXX
ip ospf network point-to-point
ip ospf bfd
ip ospf cost 20000
no negotiation auto
mpls ip
port-channel bfd destination ipv4 172.18.255.30 BFD
end

R0#

IOS XR : 

J’ai eu de bonnes intentions en début d’années de produire du contenu en Français sur différents sujets réseaux et télécoms de niveau basiques, mais j’avoue que cela s’est vite arrêté.

Le but était de fournir tout en un :

• Video explicative ;
• Une fiche d’étude rapide au format cheatsheet ;
• Un guide de travail ;
• Un accès à un lab guidé

Bon j’avoue cela prend énormément de temps et d’autres projets personnels sont venus s’intercalés.

If as me you have EVE-NG (2.0.3) and lab some Cisco XRV9K-Full on a virtualized box running AMD Ryzen processor, you have probably encountered problem to start the image. After reading lot of website, it seems the answer is change the command line.

My original command line is :

-enable-kvm -smbios type=1,manufacturer="cisco",product=\"Cisco IOS XRv 9000\",uuid=[...] -cpu host

I correct to :

-enable-kvm -smbios type=1,manufacturer="cisco",product="Cisco IOS XRv 9000",uuid=[...] -cpu qemu64,+ssse3,+sse4.1,+sse4.2

If you are newbie snmpb user. I used snmpb mib brower to check accros some SNMPv3 IOS XR config, you can be faced to :

You must only right click to white window such as :

That’s it ! Have fun…

If you are familiar with IOS XR and JunOS, it lacks a rollback to IOS and IOS XE. You can do it with “archive” such as :

1. Configure where your archive will be stored.
2. Say to your OS to “archive” at a point
3. Configure your router with a “revert timer”
4. Confirm if it is ok for you

Here we go in details now :

1. Configure where your archive will be stored.

Router# conf t
Router(conf)# archive
Router(conf-archive)# path bootflash:myconfig
Router(conf-archive)# maximum 10
Router(conf-archive)# end
Router# wr

2. Say to your OS to “archive” at a point

It was a long long timeago I wrote here. ot of things happens to me but I don’t think it is the time and place to explain it.

This post is about a new experience to me : hosting this blog on FreeBSD machine. I am in love with BSD but don’t use it everyday. Networking&Telco is not an professional area where you can use it or your employer allow you to use it. Damn Windows, Teams, … and his egemony.

Now, I go to CCIE and need to begin by first of all : CCIE Written. And to know where to start, you begin with a __real__ self assessment on your knowledge and where to work hard to.

blueprint-ccie-written-assement-v5.1Download

Hi,

It’s been a while I have posted a blog entry. A simple tip from IOS 12.4(20) to 12.4(24) and above to use OID “.1.3.6.1.4.1.9.10.77.1.2.3.0” to graph your NAT translations :

R(conf)# ip nat service enable-mib %NAT: Old NAT-MIB support enabled R(conf)#

HTH ++Christophe