VTI tunnels vs InterVLAN

Question

Hi everyone!
We have 2 Cisco routers - 3925 (office A) and 2921 (office B). There are VTI tunneling (with 3DES encryption), EIGRP dynamic routing (main and reserve optic channels) and 1 default VLAN #2. It`s working model which is used between 2 offices.
Now I have a task to add VLAN #3 in Office B which is used in Office A and routed to FireWall. VLAN #3 must be routed bypassing VTI tunnel. As I understand I should use InterVLAN feature on both routers. But it doesn`t work. :(
Here are configs:
Office A (3925):
interface GigabitEthernet0/0
 no ip address
interface GigabitEthernet0/0.2
 encapsulation dot1Q 2
 ip address 192.168.100.181 255.255.255.0
interface GigabitEthernet0/0.3
 encapsulation dot1Q 3
 ip address 192.168.150.10 255.255.255.0
interface GigabitEthernet0/1
 no ip address
interface GigabitEthernet0/1.2
 encapsulation dot1Q 2
 ip address 10.48.101.178 255.255.255.0
interface GigabitEthernet0/1.3
 encapsulation dot1Q 3
 ip address 10.48.103.178 255.255.255.0
router eigrp 100
 network 192.168.100.0 0.0.0.255
 network 192.168.104.0 0.0.0.255
 network 192.168.201.176 0.0.0.255
 network 192.168.202.176 0.0.0.255
ip route 0.0.0.0 0.0.0.0 192.168.100.180
ip route 10.48.103.0 255.255.255.0 GigabitEthernet0/1.3
ip route 192.168.150.0 255.255.255.0 192.168.100.2
Office B (2921):
interface GigabitEthernet0/0
 no ip address
interface GigabitEthernet0/0.2
 encapsulation dot1Q 2
 ip address 192.168.104.1 255.255.255.0
interface GigabitEthernet0/0.3
 description MOWDT Vlan 3
 encapsulation dot1Q 3
 ip address 192.168.150.11 255.255.255.0
interface GigabitEthernet0/1
 no ip address
interface GigabitEthernet0/1.2
 encapsulation dot1Q 2
 ip address 10.48.101.179 255.255.255.0
interface GigabitEthernet0/1.3
 encapsulation dot1Q 3
 ip address 10.48.103.179 255.255.255.0
router eigrp 100
 network 192.168.100.0 0.0.0.255
 network 192.168.104.0 0.0.0.255
 network 192.168.201.176 0.0.0.255
 network 192.168.202.176 0.0.0.255
ip route 0.0.0.0 0.0.0.0 192.168.100.180
ip route 10.48.103.0 255.255.255.0 GigabitEthernet0/1.3
ip route 192.168.150.0 255.255.255.0 GigabitEthernet0/1.3
Could you please assist where is the problem?

Answer 1

These both lines do the same things one is being explicitly value is defined and other is set for auto-discovery, however when it comes tunnel interface all you need is to set the mtu size to 1400.
one:  ip tcp adjust-mss 1300
two:  tunnel path-mtu-discovery
Now when an additional command, which you need to disable split-horizon on eigrp and the "x" is your process ID, which you need for spoke-to-spoke communication, to pass via the hub.
no ip split−horizon eigrp x
"If I disable these features won't i have problems with fragmentation ?"
Which is taken care by setting mtu size to 1400.
Now you set the "ip tcp adjust-mss 1380" on your physical interfaces facing toward your internal switch.
Have you tried it?
thanks
Message was edited by: Rizwan Mohamed