s0 <- 1720 -> fa0 -> 5 port basic switch <- e0 <- 1720 -> fa0 -> LAN
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VoIP phone adapters (the adapters should acatually be hanging off the switch, but my format is off in the diagram)
1. The s0 interface is connected to a T1
2. The 1720 fa0 is connected to a 5 port switch.
3. The 1721 e0 is connected to the same switch
4. There are 3 VoIP phone adapters connected to the same switch
5. The 1721 fao is the default gateway of the LAN.
The config of the 1720 is:
10.10.10.1/29 (subnet for VOip phone adapters)
ip route 0.0.0.0 0.0.0.0 126.96.36.199
The config of the 1721 is:
route 0.0.0.0 0.0.0.0 10.10.10.9
With this setup, I cannot ping, telnet or have any communication between the 1720 fa0 and the 1721 e0. I believe part of the problem is that the secondary address is not seen as routable so the gateway on the 1721 should actually be 10.10.10.1 (the primary of the interface). Can anyone help me with this config? Do I need a switch that does VLANs?
10.10.10.9/30 is the network number, not a valid address(unless you use IP SUBNET ZERO). Use 10 and 11 as the host addresses, 9 is the network number and 12 is the broadcast address.
There is a technical issue when you configure one router with a primary and secondary address and another router on the same segment with only the secondary. I cannot remember the TAC document, but it can cause some routing issues and in general is probably not a good practice.
If you had to keep the config, make the 10.10.10.9/30 network as your primary and make the 10.10.10.0/29 network as the secondary on the WAN router only. That way, your primary(WAN) is talking to the only address on the LAN router.
Did you try changing primary and secondary address definitions of fast 0 interface? This would help you to access both addresses. Generally, using highest address as secondary from the similar subnets would cause some network routing problems. Probably adding a static route for inaccessible network to the router which has two interface address, will solve the problem but I'm not sure and I am unable to try on my lab now.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...