Hi,
I have the following -
interface Tunnel0
description VPN TEST
ip address 172.27.240.10 255.255.255.252
ip mtu 1452
ip virtual-reassembly in
qos pre-classify
tunnel source FastEthernet0/1
tunnel mode ipsec ipv4
tunnel destination x.x.x.x
tunnel protection ipsec profile TEST
end
However, when I do a show interface tu0 I see the following - I have omitted most of Output from this. Is there a specific reason for the difference in 6 bytes?
Tunnel0 is up, line protocol is up
Hardware is Tunnel
Description: TEST
Internet address is 172.27.240.10/30
MTU 17886 bytes, BW 100 Kbit/sec, DLY 50000 usec,
reliability 255/255, txload 255/255, rxload 255/255
Encapsulation TUNNEL, loopback not set
Keepalive not set
Tunnel source xxxx FastEthernet0/1), destination yyyyyy
Tunnel Subblocks:
src-track:
Tunnel0 source tracking subblock associated with FastEthernet0/1
Set of tunnels with source FastEthernet0/1, 1 member (includes iterators), on interface <OK>
Tunnel protocol/transport IPSEC/IP
Tunnel TTL 255
Tunnel transport MTU 1446 bytes
On the opposite end of this VPN tunnel - I see the following -
interface Tunnel32
description TEST VPN
ip address 172.27.240.9 255.255.255.252
ip mtu 1452
qos pre-classify
tunnel source FastEthernet0/0
tunnel destination y.y.y.y
tunnel mode ipsec ipv4
tunnel protection ipsec profile TEST
end
When I do a show interface Tu32 however, I do not see the transport MTU configured as i do on the other router so I'm not entirely sure if the route is indeed honoring my IP MTU command of 1452
sh int tu32
Tunnel32 is up, line protocol is up
Hardware is Tunnel
Description: TEST
Internet address is 172.27.240.9/30
MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
reliability 255/255, txload 48/255, rxload 148/255
Encapsulation TUNNEL, loopback not set
Keepalive not set
Tunnel source y.y.y.y (FastEthernet0/0), destination xxxxx
Tunnel protocol/transport IPSEC/IP
Tunnel TTL 255
Fast tunneling enabled
Tunnel transmit bandwidth 8000 (kbps)
Tunnel receive bandwidth 8000 (kbps)
Any ideas on why I am not seeing my configured MTU under the show interface command?
