ipv6 between Cisco 1841 & Cisco 1811

[Andrew.Ghorev]

    To debug big network (commerce bank) I created small network from the same types netdevices as big network (Cisco 7206VXR, Cisco 1841, Cisco 1811, Cisco 2960, LINKSYS SRW224G4 ...). But I haven't enough switches and using VLANs on routers instead switches to concentrate vlans. 

     And get:

   on  Cisco 1841 & Cisco 1811 hardware: 4ESW card configured with vlans & trunks:

1. on 1841 & 1811 the same situation: if interfaces f0/0, f0/1 on Cisco 1841 or interfaces f0, f1 on Cisco 1811 contains vlans, then no IP packets forwarding;
2. to get IP packets forwarding used bridges. IP packets forwarding OK, but IPv6 - NO IPv6 packets forwarding.

   In config file:

bridge irb

   Test-1841#sh int su

* FastEthernet0/0 0 0 0 0 14000 5 34000 16 0
* FastEthernet0/0.2 - - - - - - - - -
* FastEthernet0/0.3 - - - - - - - - -
* FastEthernet0/0.4 - - - - - - - - -
* FastEthernet0/0.5 - - - - - - - - -
* FastEthernet0/0.6 - - - - - - - - -

* BVI1 0 0 0 0 0 0 0 0 0
* BVI2 0 0 0 0 14000 6 12000 7 0
* BVI3 0 0 0 0 0 0 0 0 0

Interface IHQ IQD OHQ OQD RXBS RXPS TXBS TXPS TRTL
-----------------------------------------------------------------------------------------------------------------
* BVI6 0 0 0 0 0 0 0 0 0

* Vlan1 0 0 0 0 0 0 0 0 0
* Vlan2 0 0 0 0 34000 6 18000 3 0
* Vlan3 0 0 0 0 5000 0 0 0 0
* Vlan4 0 0 0 0 0 0 0 0 0
* Vlan5 0 0 0 0 0 0 0 0 0
* Vlan6 0 0 0 0 0 0 0 0 0

      Something like Cisco 1811.

Test-1841# sh bridg

...

Bridge Group 2:

10fe.ed03.829b forward Fa0/0.2 0 687094 854872
001d.a2b3.ca4e forward Vlan2 0 1317521 22774
b827.eb31.e07f forward Vlan2 0 6181 4778
0007.3b02.3e9a forward Vlan2 0 4978 5
001a.92be.04ed forward Vlan2 0 1454176 322371

       Vlan2 & inteface f0/0.2 - IPv6 addressed. bridge 2 route ip. Cisco 1841 ping ipv6.google.com - OK. Cisco 1811 (behind Cisco 1841) - NO! 

But!  Notebook BEHIND Cisco 1811 - OK! 

       What I do wrong with IPv6 ?!?!?! Cisco 1841 or Cisco 1811? Notebook (Linux OS) with trunks TOO! It has Vlan2 & Vlan3. With all vlans on notebook - OK.

[Philip D'Ath]

Those are pretty old devices.  I'm guessing you'll need to update the IOS on them.

[Andrew.Ghorev]

Yes. But 1841 - IOS 15.2, only 1811 - IOS 12.4.

[Philip D'Ath]

Upgrade the 1811.  That will be the issue.

[Andrew.Ghorev]

I think it's not the IOS version, since if you do not use VLANs on interfaces F0/x or Fx Cisco 1841 and 1811 respectively, all in norm - IPv6 OK.

[johnd2310]

Hi,

What is the configuration of 4ESW on 1841 and 1811 that is causing "no ip packet  forwarding"? you should be able to configure trunks and access ports on the 4ESW.

Thanks

John

[Andrew.Ghorev]

int f0/1/0, f0/1/2 - trunk, f0/1/2 - Vlan2, f0/1/3 - Vlan3.

int vlan2 & vlan3 hasn't ip/ipv6 addresses. IP/IPv6 address on bridges (BVI2, BVI3).

[Andrew.Ghorev]

interface FastEthernet0/1/0
switchport mode trunk
no ip address

end

      The same on F0/1/1. Both (1841, 1811) have identical configurations for 4ESW. 4ESW 1841 connected with 4ESW 1811. Ports f0/0 & f0/1 1841's - trunk ports. The same for 1811.

* FastEthernet0/0 0 0 0 0 13000 5 35000 15 0
* FastEthernet0/0.2 - - - - - - - - -
* FastEthernet0/0.3 - - - - - - - - -
* FastEthernet0/0.4 - - - - - - - - -
* FastEthernet0/0.5 - - - - - - - - -
* FastEthernet0/0.6 - - - - - - - - -

   For example F0/0.2:

interface FastEthernet0/0.2
description Vlan 2 - 192.168.223.2/24.
encapsulation dot1Q 2
bridge-group 2
end

       Bridges are result "no IP forwarding". Without trunk on F0/0, F0/1 all worked well, no bridge need. But if F0/0, F0/1 (1841) or F0, F1 (1811) trunk => no packet forwarding. Why? Don't understood! No packets seen on 4ESW interfaces when F0/0 - trunk. Checked by connected to both interfaces Linux OS notebook & PC.