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7606 subinterface query

Hi All ,

We are having a set up  like   ME3400 SW ---------7606-S  --------------ME3400 SW

In this network i had created a int vlan with same range of IP address in both ME 3400 switch ( VLAN 20 with 10.0.0.0/30 )

In 7606 device I configured subinterface with VLAN 20 on both the ports and the VLAN is created globally .I can able to assign same VLAN ID to different sub-interface in 7606 but I can,t able to ping from one 3400 SW to another.

Is this design is valid.Pleae help.

thanks,

Arun Mohan

5 Replies 5

InayathUlla Sharieff
Cisco Employee
Cisco Employee

Arun,

It could be that STP is blocking the port but not sure just assumption.

Kindly let us know the following thing:

1- Please provide brief summary of what you are trying to achieve ?

2- Make sure the ports are trunk and they are e not pruned  and not blocked by stp

3- Whats the status of vlan interface? Were exactly is it failing? Doe 7600 router able to ping the Me 3400 respectively ?

regards

Inayath

STP instance is not running for that VLAN.In this set up 7606 act as a L2 device so no IP is configured on 7606

R1#sh spanning-tree vlan 20

Spanning tree instance(s) for vlan 20 does not exist.

R1#sh vlan id 20

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

20   TEST                             active

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

20   enet  100020     1500  -      -      -        -    -        0      0

Remote SPAN VLAN

----------------

Disabled

Primary Secondary Type              Ports

------- --------- ----------------- ------------------------------------------

R1#sh vlans 20

VLAN ID: 20 (IEEE 802.1Q Encapsulation)

   Protocols Configured:          Received:        Transmitted:

VLAN trunk interfaces for VLAN ID 20:

FastEthernet1/1/2.20

      Total 2143 packets, 145332 bytes input

      Total 0 packets, 0 bytes output

FastEthernet2/1/1.20

      Total 2083 packets, 141576 bytes input

      Total 0 packets, 0 bytes output

No subinterface configured with ISL VLAN ID 20

In both 3400 SW SVI is up and  VLAN 20 is passing through the correct trunk port towards 7600 device.

Arun,

Can you get the output of show int trunk from all the 3 devices?

SW1 FA0/23 ----- FA 2/1/1.20  7606 FA 1/1/2.20 ---------FA 0/24 SW2

R1#sh inter trunk

Port                Mode         Encapsulation  Status        Native vlan

Gi4/18              on           802.1q         trunking      1

Gi4/34              on           802.1q         trunking      1

Port                Vlans allowed on trunk

Gi4/18              113,145,148,150,196-199,203,215,218,293,498,505-506,511,513,515-519,521-522

Gi4/34              777,789,888

Port                Vlans allowed and active in management domain

Gi4/18              145,148,150,196,198-199,215,218,293,498,505-506,511,513,515-519,521-522

Gi4/34              777,789,888

Port                Vlans in spanning tree forwarding state and not pruned

Gi4/18              145,148,150,196,198-199,215,218,293,498,505-506,511,513,515-519,521-522

Gi4/34              777,789,888

C3400-SW-001#sh inter trunk

Port        Mode         Encapsulation  Status        Native vlan

Fa0/9       on           802.1q         trunking      1

Fa0/12      on           802.1q         trunking      1

Fa0/14      on           802.1q         trunking      1

Fa0/23      on           802.1q         trunking      1

Port        Vlans allowed on trunk

Fa0/9       146,250

Fa0/12      140,143,775

Fa0/14      43,146

Fa0/23      1-4094

Port        Vlans allowed and active in management domain

Fa0/9       146,250

Fa0/12      140,143,775

Fa0/14      43,146

Fa0/23      1,5,20,25,43,98,100,123,125,140,143-144,146,242,250,264,775

Port        Vlans in spanning tree forwarding state and not pruned

Fa0/9       146,250

Fa0/12      140,143,775

Fa0/14      43,146

Fa0/23      1,5,20,25,43,98,100,123,125,140,143-144,146,242,250,264,775

C3400-SW-2#sh int trunk

Port        Mode             Encapsulation  Status        Native vlan

Fa0/9       on               802.1q         trunking      1

Fa0/12      on               802.1q         trunking      1

Fa0/24      on               802.1q         trunking      1

Port        Vlans allowed on trunk

Fa0/9       412,500

Fa0/12      412,987

Fa0/24      1-4094

Port        Vlans allowed and active in management domain

Fa0/9       412,500

Fa0/12      412,987

Fa0/24      1-3,5,11-13,20,46,82-83,85,91-92,94,98,112,114,123,125,143,170,185,198,219,222,226-227,230,233,250,287,364,412,499-500,575,775,987

Port        Vlans in spanning tree forwarding state and not pruned

Fa0/9       412,500

Fa0/12      412,987

Fa0/24      1-3,5,11-13,20,46,82-83,85,91-92,94,98,112,114,123,125,143,170,185,198,219,222,226-227,230,233,250,287,364,412,499-500,575,775,987

Arun,

I dont see the vlan 20 been allowed on the trunk link of R1 router. Please make sure you add teh vlan 20 then everything should be good.

HTH

REgards

Inayath

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