I have been replicating the configuration from our old router (2621), to a 3945 ISR. One thing that I can't quite understand is the sub-interface.
My main network (Network 1) is 172.16.100.0 255.255.255.0
gi 0/0 is 172.16.100.1 255.255.255.0
gi0/1 has no ip
There is only one subinterface (gi0/1.3)
description ---------------------------------> Network 2
encapsulation dot1Q 3
ip address 10.1.86.14 255.255.255.0
On the switch (which is basically a 3750) the port that is connected is trunked
interface FastEthernet0/3
description to 3945 router gi0/1
switchport mode trunk
spanning-tree portfast (I realize this doesn't do anything on trunked ports)
The problem is, I can't ping 10.1.86.14 from any PC connected. The PC's that are connected to the switch have an IP of 172.16.100.xxx and a gateway of 172.16.100.1
I can't even ping 10.1.86.14 from the switch's cmd line. I can ping 172.16.100.1 from it.
This all works on the old router (2621) and switch (2950), and the config is identical.
The 10.1.86.14 sub-interface is connected to a different company's router, and that router has IP routes in it that allow us in to their network, but only from this 10.1.86.14 address. All of my machines have to talk to this sub-interface in order to reach the other company's network.
Any insight to this?
I ran the following commands on the router and switch, here is the output:
On the Router:
hpra-3945#sh ip int br
Interface IP-Address OK? Method Status Proto col
Embedded-Service-Engine0/0 unassigned YES NVRAM administratively down down
GigabitEthernet0/0 172.16.100.1 YES NVRAM up up
GigabitEthernet0/1 unassigned YES NVRAM up up
GigabitEthernet0/1.3 10.1.86.14 YES NVRAM up up
GigabitEthernet0/2 unassigned YES NVRAM administratively down down
GigabitEthernet4/0 unassigned YES NVRAM administratively down down
GigabitEthernet4/1 unassigned YES unset administratively down down
Vlan1 unassigned YES unset administratively down down
hpra-3945#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is 192.168.1.1 to network 0.0.0.0
S* 0.0.0.0/0 [1/0] via 192.168.1.1
10.0.0.0/8 is variably subnetted, 34 subnets, 4 masks
S 10.0.0.2/32 [1/0] via 172.16.100.200
S 10.1.81.0/24 [1/0] via 172.16.100.0
C 10.1.86.0/24 is directly connected, GigabitEthernet0/1.3
L 10.1.86.14/32 is directly connected, GigabitEthernet0/1.3
S 10.1.87.0/24 [1/0] via 10.1.86.250
S 10.1.88.0/24 [1/0] via 10.1.86.250
S 10.1.89.0/24 [1/0] via 10.1.86.250
S 10.1.90.0/24 [1/0] via 10.1.86.250
S 10.1.240.158/32 [1/0] via 172.16.100.200
S 10.2.35.0/24 [1/0] via 172.16.100.200
S 10.2.116.0/22 [1/0] via 172.16.100.200
S 10.5.0.0/24 [1/0] via 172.16.100.2
S 10.5.1.0/24 [1/0] via 172.16.100.2
S 10.8.20.0/24 [1/0] via 172.16.100.200
S 10.10.2.0/24 [1/0] via 172.16.100.200
S 10.10.4.0/22 [1/0] via 172.16.100.200
S 10.10.6.0/24 [1/0] via 172.16.100.200
S 10.10.8.0/21 [1/0] via 172.16.100.200
S 10.10.10.0/24 [1/0] via 172.16.100.200
S 10.10.96.0/21 [1/0] via 172.16.100.200
S 10.20.148.0/22 [1/0] via 172.16.100.201
S 10.64.2.0/24 [1/0] via 172.16.100.200
S 10.74.25.0/24 [1/0] via 172.16.100.201
S 10.80.4.0/24 [1/0] via 172.16.100.200
S 10.81.1.0/24 [1/0] via 10.1.86.1
S 10.85.91.0/24 [1/0] via 172.16.100.200
S 10.110.10.0/24 [1/0] via 172.16.100.200
S 10.110.12.0/24 [1/0] via 172.16.100.200
S 10.110.20.0/24 [1/0] via 172.16.100.200
S 10.141.45.0/24 [1/0] via 172.16.100.200
S 10.145.190.10/32 [1/0] via 172.16.100.75
S 10.145.194.15/32 [1/0] via 172.16.100.75
S 10.152.50.0/24 [1/0] via 172.16.100.200
S 10.239.66.45/32 [1/0] via 172.16.100.2
65.0.0.0/32 is subnetted, 1 subnets
S 65.120.142.130 [1/0] via 172.16.100.200
66.0.0.0/24 is subnetted, 2 subnets
S 66.230.23.0 [1/0] via 172.16.100.200
S 66.230.30.0 [1/0] via 172.16.100.200
69.0.0.0/24 is subnetted, 1 subnets
S 69.175.136.0 [1/0] via 172.16.100.200
144.54.0.0/32 is subnetted, 3 subnets
S 144.54.40.170 [1/0] via 172.16.100.132
S 144.54.120.15 [1/0] via 172.16.100.132
S 144.54.120.41 [1/0] via 172.16.100.132
172.16.0.0/16 is variably subnetted, 9 subnets, 3 masks
S 172.16.17.50/32 [1/0] via 10.1.86.1
S 172.16.40.0/24 [1/0] via 10.1.86.1
S 172.16.53.0/24 [1/0] via 10.1.86.1
S 172.16.55.0/24 [1/0] via 10.1.86.1
C 172.16.100.0/24 is directly connected, GigabitEthernet0/0
L 172.16.100.1/32 is directly connected, GigabitEthernet0/0
S 172.16.120.0/22 [1/0] via 10.1.86.1
S 172.16.150.0/24 [1/0] via 172.16.100.200
S 172.16.151.0/24 [1/0] via 172.16.100.201
172.18.0.0/32 is subnetted, 1 subnets
S 172.18.10.190 [1/0] via 10.1.86.1
172.20.0.0/16 is variably subnetted, 4 subnets, 2 masks
S 172.20.2.19/32 [1/0] via 172.16.100.2
S 172.20.6.178/32 [1/0] via 172.16.100.2
S 172.20.7.190/32 [1/0] via 172.16.100.2
S 172.20.110.0/23 [1/0] via 10.1.86.1
172.21.0.0/16 is variably subnetted, 2 subnets, 2 masks
S 172.21.80.0/22 [1/0] via 172.16.100.200
[1/0] via 172.16.100.0
S 172.21.172.0/24 [1/0] via 172.16.100.200
[1/0] via 172.16.100.2
172.30.0.0/16 is variably subnetted, 2 subnets, 2 masks
S 172.30.4.11/32 [1/0] via 10.1.86.250
S 172.30.172.0/24 [1/0] via 172.16.100.0
172.31.0.0/32 is subnetted, 4 subnets
S 172.31.2.26 [1/0] via 172.16.100.200
S 172.31.2.173 [1/0] via 172.16.100.200
S 172.31.2.223 [1/0] via 172.16.100.200
S 172.31.2.233 [1/0] via 172.16.100.200
192.9.200.0/32 is subnetted, 1 subnets
S 192.9.200.208 [1/0] via 172.16.100.200
S 192.158.1.0/24 [1/0] via 172.16.100.201
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
S 192.168.1.0/24 [1/0] via 172.16.100.2
S 192.168.1.201/32 [1/0] via 172.16.100.200
192.168.2.0/24 is variably subnetted, 5 subnets, 2 masks
S 192.168.2.0/24 [1/0] via 10.1.86.250
S 192.168.2.1/32 [1/0] via 172.16.100.200
S 192.168.2.105/32 [1/0] via 172.16.100.200
S 192.168.2.106/32 [1/0] via 172.16.100.200
S 192.168.2.199/32 [1/0] via 172.16.100.200
S 192.168.10.0/24 [1/0] via 172.16.100.200
192.168.15.0/32 is subnetted, 1 subnets
S 192.168.15.15 [1/0] via 172.16.100.200
S 192.168.21.0/24 [1/0] via 172.16.100.200
S 192.168.35.0/24 [1/0] via 10.1.86.1
S 192.168.51.0/24 [1/0] via 10.1.86.1
S 192.168.70.0/24 [1/0] via 172.16.100.200
S 192.168.229.0/24 [1/0] via 172.16.100.200
S 192.168.253.0/24 [1/0] via 172.16.100.200
S 192.168.254.0/24 [1/0] via 172.16.100.200
S 208.122.128.0/18 [1/0] via 172.16.100.200
S 208.122.170.0/24 [1/0] via 172.16.100.200
S 208.122.180.0/24 [1/0] via 172.16.100.200
S 208.122.184.0/24 [1/0] via 172.16.100.200
S 208.122.185.0/24 [1/0] via 172.16.100.200
S 208.122.186.0/24 [1/0] via 172.16.100.200
S 208.122.187.0/24 [1/0] via 172.16.100.200
On the Switch:
hpra-3750#sh vlan br
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Gi0/1, Gi0/2, Gi0/4, Gi0/5
Gi0/11, Gi0/12, Gi0/13, Gi0/14
Gi0/15, Gi0/16, Gi0/17, Gi0/18
Gi0/19, Gi0/20, Gi0/21, Gi0/22
Gi0/23, Gi0/24, Gi0/25, Gi0/26
Gi0/27, Gi0/28, Gi0/29, Gi0/30
Gi0/31, Gi0/32, Gi0/33, Gi0/34
Gi0/35, Gi0/36, Gi0/37, Gi0/38
Gi0/39, Gi0/40, Gi0/41, Gi0/42
Gi0/43, Gi0/44, Gi0/45, Gi0/46
Gi0/47, Gi0/48, Gi0/49, Gi0/50
Gi0/51
2 Public active Gi0/6, Gi0/7, Gi0/8
3 BSADI_Lan active Gi0/9
4 HPRA_Internet active Gi0/10
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
hpra-3750#sh int trunk
Port Mode Encapsulation Status Native vlan
Gi0/3 on 802.1q trunking 1
Port Vlans allowed on trunk
Gi0/3 1-4094
Port Vlans allowed and active in management domain
Gi0/3 1-4
Port Vlans in spanning tree forwarding state and not pruned
Gi0/3 1-4
