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 : 

RP/0/RSP0/CPU0:R1#show conf run int be10000
Tue Feb 14 14:49:35.026 CET
interface Bundle-Ether10000
description *** Vers R0_Po14 *** 
bfd mode ietf
bfd address-family ipv4 multiplier 3
bfd address-family ipv4 destination 172.18.255.29
bfd address-family ipv4 fast-detect
bfd address-family ipv4 minimum-interval 200
mtu 9216
ipv4 address 172.18.255.30 255.255.255.252
!

RP/0/RSP0/CPU0:R1#

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.

Bref autant partagé ce qu’il en reste et amusez-vous bien :

• http://www.ip-expert.fr/documents/VTP/
• http://www.ip-expert.fr/documents/OSI-Niveau2/Vlan_Trunking_DTP/

Soyez pas trop durs …

L’accès à la partie Lab est bien évidemment depuis périmé (on peut donner des durées d’utilisation avec pnetlab :)).

A plus,

Christophe

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

Router# archive config 
Router# 
Router# show archive
The maximum archive configurations allowed is 10.
There are currently 1 archive configurations saved.
The next archive file will be named bootflash:myconfig-<timestamp>-1
 Archive #  Name
   1        bootflash:myconfig-Jan--3-2022-08-34-34.348-CET-0 <- Most Recent
   2         
   3         
   4         
   5         
   6         
   7         
   8         
   9         
   10   
Router#     

3. Configure your router with a “revert timer”

Router# configure terminal revert timer 1
Router(conf)# Rollback Confirmed Change: Backing up current running config to bootflash:myconfig-Jan--3-2022-08-35-01.511-CET-1

Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#Rollback Confirmed Change: Rollback will begin in one minute.
Enter "configure confirm" if you wish to keep what you've configured

*Jan  3 2022 08:35:01.670 CET: %ARCHIVE_DIFF-5-ROLLBK_CNFMD_CHG_BACKUP: Backing up current running config to bootflash:myconfig-Jan--3-2022-08-35-01.511-CET-1
*Jan  3 2022 08:35:01.670 CET: %ARCHIVE_DIFF-5-ROLLBK_CNFMD_CHG_START_ABSTIMER: User: console(Priv: 15, View: 0): Scheduled to rollback to config bootflash:myconfig-Jan--3-2022-08-35-01.511-CET-1 in 1 minutes
*Jan  3 2022 08:35:01.670 CET: %ARCHIVE_DIFF-5-ROLLBK_CNFMD_CHG_WARNING_ABSTIMER: System will rollback to config bootflash:myconfig-Jan--3-2022-08-35-01.511-CET-1 in one minute. Enter "configure confirm" if you wish to keep what you've configured
Router(conf)# hostname BLAH
BLAH(conf)#
[................... WAITING FOR A MINUTE ........................]
Rollback Confirmed Change: rolling to:bootflash:myconfig-Jan--3-2022-08-35-01.511-CET-1

!Pass 1
!List of Rollback Commands:
no hostname BLAH
hostname Router
end


Total number of passes: 1
Rollback Done

*Jan  3 2022 08:36:01.669 CET: %ARCHIVE_DIFF-5-ROLLBK_CNFMD_CHG_ROLLBACK_START: Start rolling to: bootflash:myconfig-Jan--3-2022-08-35-01.511-CET-1
*Jan  3 07:36:01.722: Rollback:Acquired Configuration lock.


Router(conf) # end

4. Confirm if it is ok for you

If between your “conf t revert time X” and t0+X, you are ok with the configuration you have made, so you can confirm your changes.

Router# configure confirm

That’s it ! Have fun.

Hello guys,

Here it is a tips / reminder how to implement an site-ot-site IKEv2 tunnel :

crypto ikev2 proposal aes-cbc-256-proposal 
 encryption aes-cbc-256
 integrity sha1
 group 2
crypto ikev2 policy policy1 
 match address local x.x.x.x
 proposal aes-cbc-256-proposal
crypto ikev2 keyring v2-kr1
 peer abc
  address y.y.y.y
  pre-shared-key somesecretpass
 !
crypto ikev2 profile profile1
 description IKEv2 profile
 match address local x.x.x.x
 match identity remote address y.y.y.y 255.255.255.255 
 authentication local pre-share
 authentication remote pre-share
 keyring v2-kr1

crypto ipsec transform-set myset esp-des esp-md5-hmac 

crypto map mymap 20 ipsec-isakmp 
 set peer y.y.y.y
 set security-association lifetime seconds 27000
 set transform-set ESP-AES-SHA 
 set ikev2-profile profile1
 match address 120

With ACL 120 is your flows / SA and your implement your crypto map on your WAN interface.