From: Church, Chuck (cchurch@netcogov.com)
Date: Wed May 25 2005 - 23:56:16 GMT-3
The native VLAN is unique in that it's the one that's used for CDP, VTP,
PagP, DTP, BPDUs, etc. At least it is when the native VLAN is 1. When
both the switch and the router are using 4 as native, are you still
receiving these frames? It's remotely possible that a bug is preventing
it from working as well...
Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Netco Government Services - Design & Implementation Team
1210 N. Parker Rd.
Greenville, SC 29609
Home office: 864-335-9473
Cell: 703-819-3495
cchurch@netcogov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
gladston@br.ibm.com
Sent: Wednesday, May 25, 2005 8:15 PM
To: Ed Lui
Cc: ccielab@groupstudy.com; Troy Levin
Subject: Re: Help with Native Vlan
Hi Ed,
Sorry. Wrong diagram. It is R4 instead of R1.
I am working on native between R4 and CAT1.
R4 is connected to CAT1, fa0/4, configured as trunk, nonegotiate; if
native vlan is 1, it works just fine; if native vlan is 4 on CAT1 and
R4,
it does not work. Show vlan on R4 shows it sends traffic on Vlan 4, but
do
not receive.
I could not find a debug on CAT1 that could show helpful information on
what is going on.
R7 is just for testing purposes. It is connected on CAT1, fa0/7, vlan4.
Cordially,
------------------------------------------------------------------
Gladston
Ed Lui <edwlui@gmail.com>
25/05/2005 19:24
Please respond to
Ed Lui
To
Alaerte Gladston Vidali/Brazil/IBM@IBMBR
cc
Troy Levin <troylevin@hotmail.com>, ccielab@groupstudy.com
Subject
Re: Help with Native Vlan
Gladston,
Not sure if the host name corresponds to the router ? Looks like you
were working on router 4(Rack2R4) vs router 1(as shown on your
diagram)
R1----trunk----CAT1---vlan4--R7
HTH,
Ed Lui
On 5/25/05, gladston@br.ibm.com <gladston@br.ibm.com> wrote:
> Yes, R7 is configured to be on Vlan4 on CAT1, port fa0/7.
>
> Everything works fine until I try to test native vlan.
>
> Native vlan is the same on both sides, R4 e0/0.4 and CAT1 fa0/4.
>
> Cordially
> ------------------------------------------------------------------
> Gladston
>
>
>
> "Troy Levin" <troylevin@hotmail.com>
> 25/05/2005 17:34
>
> To
> Alaerte Gladston Vidali/Brazil/IBM@IBMBR, <ccielab@groupstudy.com>
> cc
>
> Subject
> Re: Help with Native Vlan
>
>
>
>
>
>
> Gladston.
>
> Is your CAT1 port connected to R7 configured for vlan4? If so then
your
> traffic from R1 fa0/0.4 will be received by CAT1 as untagged and will
be
> processed according to tables of SPT instance 4 which includes the
port
to
> R7.
>
> HTH,
>
> Troy
> ----- Original Message -----
> From: <gladston@br.ibm.com>
> To: <ccielab@groupstudy.com>
> Sent: Wednesday, May 25, 2005 1:25 PM
> Subject: Help with Native Vlan
>
>
> > If configuring native vlan other than 1, connectivity is lost.
> >
> > Any idea?
> > version is 12.2(15)T5 for router 2600 and 12.1(20)EA1a for 3550
> >
> > As it is an unexpected behavior I tested on another router and 3550.
> (but
> > the IOS is the same).
> >
> > R1----trunk----CAT1---vlan4--R7
> >
> > Rack2R4#sh run int e 0/0.4
> > Building configuration...
> >
> > Current configuration : 650 bytes
> > !
> > interface Ethernet0/0.4
> > encapsulation dot1Q 4 native
> > ip address 142.20.44.4 255.255.255.0
> > ip access-group 150 in
> > ip directed-broadcast
> > ip multicast helper-map broadcast 229.1.1.1 110
> > rate-limit input access-group 121 512000 64000 96000 conform-action
> > continue exceed-action
> > drop
> > rate-limit input access-group 122 64000 8000 12000 conform-action
> transmit
> > exceed-action dr
> > op
> > rate-limit input access-group 123 32000 4000 6000 conform-action
> transmit
> > exceed-action dro
> > p
> > no ip mroute-cache
> > ip policy route-map Local-traffic
> > ntp multicast 229.2.2.2
> > ipv6 address 2001:1:1:4::4/64
> > ipv6 address FEC0:2E3D:5B7C:4::4/64
> > ipv6 nd suppress-ra
> > end
> >
> > Rack2R4#
> > Rack2R4#sh vlan
> >
> > Virtual LAN ID: 1 (IEEE 802.1Q Encapsulation)
> >
> > vLAN Trunk Interface: Ethernet0/0
> >
> > Protocols Configured: Address: Received:
> > Transmitted:
> >
> > Virtual LAN ID: 4 (IEEE 802.1Q Encapsulation)
> >
> > vLAN Trunk Interface: Ethernet0/0.4
> >
> > This is configured as native Vlan for the following interface(s) :
> > Ethernet0/0
> >
> > Protocols Configured: Address: Received:
> > Transmitted:
> > IP 142.20.44.4 37
> > 90
> >
> > Rack2R4#
> >
> >
> > Rack2CAT1#sh run int fa 0/4
> > Building configuration...
> >
> > Current configuration : 203 bytes
> > !
> > interface FastEthernet0/4
> > switchport trunk encapsulation dot1q
> > switchport trunk native vlan 4
> > switchport mode trunk
> > switchport nonegotiate
> > mls qos trust ip-precedence
> > spanning-tree portfast
> > end
> >
> > Rack2CAT1#sh int fa 0/4 sw
> > Name: Fa0/4
> > Switchport: Enabled
> > Administrative Mode: trunk
> > Operational Mode: trunk
> > Administrative Trunking Encapsulation: dot1q
> > Operational Trunking Encapsulation: dot1q
> > Negotiation of Trunking: Off
> > Access Mode VLAN: 1 (default)
> > Trunking Native Mode VLAN: 4 (VLAN0004)
> > Voice VLAN: none
> > Administrative private-vlan host-association: none
> > Administrative private-vlan mapping: none
> > Administrative private-vlan trunk native VLAN: none
> > Administrative private-vlan trunk encapsulation: dot1q
> > Administrative private-vlan trunk normal VLANs: none
> > Administrative private-vlan trunk private VLANs: none
> > Operational private-vlan: none
> > Trunking VLANs Enabled: ALL
> > Pruning VLANs Enabled: 2-1001
> > Capture Mode Disabled
> > Capture VLANs Allowed: ALL
> > Protected: false
> > Unknown unicast blocked: disabled
> > Unknown multicast blocked: disabled
> > Appliance trust: none
> >
> > Rack2R4(config-subif)#do pi 142.20.44.7
> >
> > Type escape sequence to abort.
> > Sending 5, 100-byte ICMP Echos to 142.20.44.7, timeout is 2 seconds:
> > ..
> >
> >
> > If native vlan is default, works fine:
> >
> > Rack2R4(config-subif)# encapsulation dot1Q 4
> >
> > Rack2CAT1(config-if)#sw tr na v 1
> >
> > Rack2R4(config-subif)#do pi 142.20.44.7
> >
> > Type escape sequence to abort.
> > Sending 5, 100-byte ICMP Echos to 142.20.44.7, timeout is 2 seconds:
> > !!!!!
> >
> > This is the network:
> >
> > R1----trunk----CAT1---vlan4--R7
> >
> >
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