[c-nsp] ASR 9922 IOS-XR 4.3.1

[Harvey]

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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