[c-nsp] ASR 9922 IOS-XR 4.3.1

[Arie Vayner (avayner)]

Can you please sniff/debug the whole RSVP setup process?

We had a really old issue, which seems kind of similar (this one was with an Alcatel box) - CSCsb94418 "MPLS-TE Tailend does not reflect Path MTU into max unit"

<B>Symptom:</B>

The "max unit" in the FLOWSPEC of an RSVP RESV message sent by an MPLS TE tailend  is hardcoded to 500 bytes.

When creating a RESV message, an MPLS TE tailend should use the "Path MTU" value received in the ADSPEC of the  PATH message as the value of "max unit"  in the FLOWSPEC of  the RESV message.

<B>Conditions:</B>

This happens on a MPLS TE tailend running IOS XR.

<B>Workaround:</B>

There is no workaround.

Tnx
Arie

-----Original Message-----
From: Harvey [mailto:harveyyoung at gmail.com] 
Sent: Tuesday, July 30, 2013 21:27 PM
To: Arie Vayner (avayner)
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] ASR 9922 IOS-XR 4.3.1

Hello,

The other side is a brocade. I confirmed via sniffing the transmitted rsvp packets from the ASR are set with mtu 500. Any idea where it's getting this from and how it can be changed ? 

Cheers,

Harvey Young

On Jul 30, 2013, at 8:45 PM, "Arie Vayner (avayner)" <avayner at cisco.com> wrote:

> Harvey,
> 
> Can you please tell me what's on the other side?
> 
> Tnx
> Arie
> 
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf 
> Of Harvey Young
> Sent: Tuesday, July 30, 2013 18:18 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] ASR 9922 IOS-XR 4.3.1
> 
> Hello Experts,
> 
> Question:
> 
> How is the T Spec MTU set on the ASR? I am running into a wall, the ASR sends T Spec mtu of 500 for an RSVP LSP. However, 500 is not set anywhere.
> I have the following MTU set: (Including snip bits from configuration, 
> see
> below)
> 
> Essentially the setup is an RSVP-TE LSP and a L2PW utilizing the LSP. The remote end is sending 9198, however since the ASR is sending 500, 500 the lower mtu is negotiated and used.
> 
> <cisco-nsp at puck.nether.net>HundredGigE0/1/0/0 is Up, ipv4 protocol is 
> Up  Vrf is default (vrfid 0x60000000)  Internet address is 13.1.1.1/24  
> MTU is 9212 (9198 is available to IP)
> 
> 
> RP/0/RP0/CPU0:ios#show running-config interface Tue Jul 30 
> 18:02:22.481 UTC interface Loopback1
> ipv4 address 1.1.1.1 255.255.255.255
> !
> interface tunnel-te1
> ipv4 unnumbered Loopback1
> mpls
>  mtu 9198
> !
> destination 7.7.7.7
> path-option 1 dynamic
> !
> interface HundredGigE0/1/0/0
> mtu 9212
> ipv4 address 13.1.1.1 255.255.255.0
> mpls
>  mtu 9198
> !
> interface HundredGigE0/1/0/1.1 l2transport  encapsulation dot1q 1 second-dot1q 1  mtu 1528 !
> RP/0/RP0/CPU0:ios#show running-config l2vpn Tue Jul 30 18:04:05.107 
> UTC l2vpn  router-id 1.1.1.1  pw-class 1  encapsulation mpls
>   protocol ldp
>   preferred-path interface tunnel-te 1  !
> !
> xconnect group 1
>  p2p 1
>   interface HundredGigE0/1/0/1.1
>   neighbor ipv4 7.7.7.7 pw-id 1
>    pw-class 1
>   !
> mpls traffic-eng
> interface tunnel-te1
> !
> interface HundredGigE0/1/0/0
> !
> attribute-set path-option 1
> !
> !
> mpls ldp
> neighbor 7.7.7.7 targeted
> !
> 
> rsvp
> interface Loopback1
> !
> interface tunnel-te1
>  bandwidth percentage 100
> !
> interface HundredGigE0/1/0/0
> !
> !
> 
> Trace from remote system:
> 
> 
> Recv PATH From:1.1.1.1, To:7.7.7.7
>          TTL:255, Checksum:0x25f1, Flags:0x1
> Session    - EndPt:7.7.7.7, TunnId:1, ExtTunnId:1.1.1.1
> SessAttr   - Name:ios_t1
>             SetupPri:7, HoldPri:7, Flags:0x4
> RSVPHop    - Ctype:1, Addr:13.1.1.1, LIH:100663488
> TimeValue  - RefreshPeriod:45
> SendTempl  - Sender:1.1.1.1, LspId:12
> SendTSpec  - Ctype:QOS, CDR:0.000 bps, PBS:8.000 Kbps, PDR:0.000 bps
>             MPU:40, *MTU:500* <------
> LabelReq   - IfType:General, L3ProtID:2048
> ERO        - IPv4Prefix 13.1.1.2/32, Strict
>             IPv4Prefix 7.7.7.7/32, Strict
> AdSpec     - General BreakBit:0, NumISHops:1, PathBwEstimate:0
>                     MinPathLatency:0, CompPathMTU:9198
>             Controlled BreakBit:0
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