[j-nsp] Different MTU size on logical interface

[Faizal Rachman]

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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