Jan 3 2009
ISIS over Frame-Relay
Configuring ISIS over frame-relay requires an additional command due to the fact that ISIS packets do not use IP at layer 3 but rather use CLNS.
Consider the topology below.
Watch the video below or alternatively download it and watch it on your iPod .
The commands used in the configuration can be found below.
R1
!
frame-relay switching
!
interface Serial1/0
ip address 10.0.0.1 255.255.255.252
ip router isis
encapsulation frame-relay
clockrate 128000
no arp frame-relay
frame-relay map clns 200 broadcast
frame-relay map ip 10.0.0.2 200
no frame-relay inverse-arp
frame-relay intf-type dce
!
router isis
net 49.0001.0000.0000.0001.00
is-type level-1
R2
!
interface Serial1/1
ip address 10.0.0.2 255.255.255.252
ip router isis
encapsulation frame-relay
no arp frame-relay
frame-relay map clns 200 broadcast
frame-relay map ip 10.0.0.1 200
no frame-relay inverse-arp
isis circuit-type level-1
!
router isis
net 49.0001.0000.0000.0002.00
Jan 03, 2009 @ 09:16:25
Hi Zismail
As far am I am aware, the following commands entered are unnecessary:
frame-relay switching <= not required for B2B FR..I’ve never needed to employ it to get ISIS to run over FR
no arp frame-relay <== legacy command which has no relevance to inverse arp
Jan 03, 2009 @ 09:30:39
Hi Roy
When I try to setup a B2B Frame-relay connection without the “frame-relay switching” command I get the following message.
R1(config-if)# frame-relay intf-type dceMust enable frame-relay switching to configure DCE/NNI
When you say B2B I assume you are not using a FR switch in between your routers.
With respect to the “no arp frame-relay” command, Im just in a habit of using this command.
Zarar
Jan 03, 2009 @ 18:22:26
Ah my bad, I didnt realise you could do B2B Frame Relay with LMI as opposed to B2B FR without LMI (l2 dte at both ends, no keepalive)
Jan 03, 2009 @ 19:11:00
Hi Roy
Yep, as always there’s always a number of configuration options. I dont know if there is a preference in the CCIE.
Zarar