Hi Nalkhande.
Thanks for your help.
MTU information goes inside the PATH message, on object ADSPEC ->
"Default General Parameters" data fragment.
What I need is the command to include in the PATH Message the following
object:
ADSPEC -> "Guaranteed Service" data fragment (described on RFC2210, item
3.3.3)
Best regards.
-
Thiago Drechsel
On Fri, 2009-08-07 at 20:30 +0530, Nalkhande Tarique Abbas wrote:
> AFAIK, JUNOS uses the Adspec field for maximum transmission unit (MTU)
> negotiation.
>
> So when an LSP is created across a set of links with different MTU
> sizes, the ingress router does not know what the smallest MTU is on the
> LSP path. By default, the maximum packet size for the LSP is based on
> the MTU for the outgoing interface for the LSP on the ingress router.
>
> If this MTU is larger than the MTU of one of the intermediate links,
> traffic might be dropped, because MPLS packets cannot be fragmented.
>
> To prevent this type of packet loss in MPLS LSPs, you can configure MTU
> signaling in RSVP. Juniper supports the Integrated Services object for
> MTU signaling in RSVP.
>
> MTU signaling in RSVP is disabled by default.
> To configure maximum transmission unit (MTU) signaling in RSVP, you need
> to configure MPLS to allow IP packets to be fragmented before they are
> encapsulated in MPLS. You also need to configure MTU signaling in RSVP.
> To configure MTU signaling in RSVP, include the path-mtu statement:
>
> path-mtu {
> allow-fragmentation;
> rsvp {
> mtu-signaling; <<--
> }
> }
>
> l...@ntarique# run show mpls lsp transit detail
> Transit LSP: 1 sessions
>
> 192.168.255.1
> From: 192.168.255.7, LSPstate: Up, ActiveRoute: 1
>
> ... truncated...
>
> FastReroute desired
> PATH rcvfrom: 192.168.245.46 (so-0/2/1.0) 42 pkts
> Adspec: received MTU 1500 sent MTU 1500 <<<---
>
>
>
> Thanks & Regards,
> Tarique A. Nalkhande
>
> -----Original Message-----
> From: juniper-nsp-boun...@puck.nether.net
> [mailto:juniper-nsp-boun...@puck.nether.net] On Behalf Of Thiago
> Drechsel
> Sent: Friday, August 07, 2009 6:37 PM
> To: Juniper List
> Subject: [j-nsp] Command to modify ADSPEC object default on PATH
> messages.
>
> Hi list.
>
> Does anybody know what is the configuration needed to add "Guaranteed
> Service" parameters, on ADSPEC object (RSVP PATH messages)?
>
> By default, I see that JUNOS only sends "Default General Parameters" and
> "Controlled Load" within PATH....
>
> Thank you!
>
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