[j-nsp] Different MTU size on logical interface

[Riku Valpas]

Hi Faizal,

May be the other end negoatiates a PPP MRU of 1492. Do you know the
configurations on the other side?

Also, are you possibly using apply-groups that might get inherited in the
interface configurations.

/riku

-- 
Riku Valpas
riku at valpas.com

> This is output from show interfaces :
>
> RouterA> show interfaces ds-0/1/6:4
> Physical interface: ds-0/1/6:4, Enabled, Physical link is Up
>   Interface index: 261, SNMP ifIndex: 265
>   Description: *** Customer A ***
>   Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: 256kbps,
> Loopback: None, FCS: 16,
>   Parent: ce1-0/1/6 Interface index 151
>   Device flags   : Present Running
>   Interface flags: Point-To-Point SNMP-Traps Internal: 0x4000
>   Link flags     : Keepalives
>   Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
>   Keepalive: Input: 114985 (00:01:47 ago), Output: 368099 (00:00:07 ago)
>   LCP state: Opened
>   NCP state: inet: Opened, inet6: Not-configured, iso: Not-configured,
> mpls:
> Not-configured
>   CHAP state: Closed
>   PAP state: Closed
>   CoS queues     : 4 supported, 4 maximum usable queues
>   Last flapped   : Never
>   Input rate     : 4208 bps (7 pps)
>   Output rate    : 7392 bps (22 pps)
>   DS0 BERT configuration:
>     BERT time period: 10 seconds, Elapsed: 0 seconds
>     Induced Error rate: 0, Algorithm: 2^15 - 1, O.151, Pseudorandom (9)
>
>   Logical interface ds-0/1/6:4.0 (Index 242) (SNMP ifIndex 290)
>     Flags: Point-To-Point SNMP-Traps 0x4000 Encapsulation: PPP
>     Protocol inet, MTU: 1500
>       Flags: Is-Primary
>       Addresses, Flags: Is-Default Is-Preferred Is-Primary
>         Destination: 10.172.84.64/30, Local: 10.172.84.65, Broadcast:
> 10.172.84.67
>
> {master}
> RouterA> show interfaces ds-0/1/6:7
> Physical interface: ds-0/1/6:7, Enabled, Physical link is Up
>   Interface index: 263, SNMP ifIndex: 347
>   Description: *** Customer B ***
>   Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: 512kbps,
> Loopback: None, FCS: 16,
>   Parent: ce1-0/1/6 Interface index 151
>   Device flags   : Present Running
>   Interface flags: Point-To-Point SNMP-Traps Internal: 0x4000
>   Link flags     : Keepalives
>   Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
>   Keepalive: Input: 357599 (00:00:00 ago), Output: 368254 (00:00:08 ago)
>   LCP state: Opened
>   NCP state: inet: Opened, inet6: Not-configured, iso: Not-configured,
> mpls:
> Not-configured
>   CHAP state: Closed
>   PAP state: Closed
>   CoS queues     : 4 supported, 4 maximum usable queues
>   Last flapped   : Never
>   Input rate     : 104 bps (0 pps)
>   Output rate    : 104 bps (0 pps)
>   DS0 BERT configuration:
>     BERT time period: 10 seconds, Elapsed: 0 seconds
>     Induced Error rate: 0, Algorithm: 2^15 - 1, O.151, Pseudorandom (9)
>
>   Logical interface ds-0/1/6:7.0 (Index 244) (SNMP ifIndex 348)
>     Flags: Point-To-Point SNMP-Traps 0x4000 Encapsulation: PPP
>     Protocol inet, MTU: 1492
>       Flags: Is-Primary
>       Addresses, Flags: Is-Default Is-Preferred Is-Primary
>         Destination: 10.172.84.252/30, Local: 10.172.84.253, Broadcast:
> 10.172.84.255
>
>
> Config for both interface are same, without define any user mtu.
>
> Thanks
> Faizal
>
> On Tue, Apr 14, 2009 at 4:30 PM, Nilesh Khambal
> <nkhambal at juniper.net>wrote:
>
>> Can you please show us an example.? It will help to understand the
>> problem
>> better.
>>
>> Thanks,
>> Nilesh
>>
>>
>>
>>
>> On Apr 14, 2009, at 2:16 AM, "Faizal Rachman"
>> <faizalr81 at gmail.com<mailto:
>> faizalr81 at gmail.com>> wrote:
>>
>>
>> Sorry if you got this message twice, iam worried there something error
>> with
>> last mail.
>>
>> On Mon, Apr 13, 2009 at 11:09 AM, Faizal Rachman <faizalr81 at gmail.com
>> <mailto:faizalr81 at gmail.com>>wrote:
>>
>> > Dear All,
>> > What is cause different MTU size on logical interface while there is
>> > on same physical interface.
>> > It happen on channelized E1 IQ without manually config interface MTU.
>> >
>> > Thanks
>> > Faizal
>> >
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