I have the following configuration.
one 3560 switch with 3 vlans, on interface 0/1 I have configured a trunk with 802.1q encapsution to two 6850 Alcatel-luccent switch (RIP is enable between the Alcatel switch).
I have configured 3 loopback interface on each switch for vlan management
From Alcatel-lucent switch I can ping the loopback on each Alcatel switch but not the loopback interface of the 3560.
The 3560 switch cannot ping the loopback of Alcatel switch, why?
someone have an idea to solve my problem?
It doesnt sound like your 3560 is participating in the routing and is acting more as a layer 2 transport between the two switches that are.
Sorry, I don't understand your reply.
3560 is layer 3 swith like the Alcatel switch (L2+ which can do routing like RIP/static route and other).
To join the loopback from the Alcatel switch it's necessary that the 3560 is layer 3?
I am not sure I have a clear picture of the network you have, but based on how I read your post you have two devices that are participating in rip routing "the alcatels". Therefore they understand where the other addresses live, based off the route advertisements, and know where to send the icmp requests. How is your 3560 participating in the routing? Do you see anything in the routing table of your Alcatels for the 3560s loopback and vice versa. I'm just wondering if you need to enable routing on the 3560. Since you are using loopbacks they would need to be advertised out for the other devices to know how to reach them or static routes need to be added.
I try to explain the topology of my network
CISCO 3560 (backbone)-> Alcatel 6850 (SWITCH13)-> Alcatel 6850 (SWITCH12)
There are a trunk with 802.1q encapsulation between 3560 and Alcatel 6850 (SWITCH13) and the RIP protocol between Alcatel 6850 (SWITCH13) and Alcatel 6850 (SWITCH12)
From Alcatel 6850 (SWITCH13) can ping all vlan on the 3560 but not the loopback interface.
Loopback0 : 10.10.10.1/32 on 3560Loopback0: 10.10.10.13/32 on Alcatel 6850 (SWITCH13)
backbone#show ip routeCodes: 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
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masksC 10.1.1.0/24 is directly connected, Vlan101C 10.10.10.1/32 is directly connected, Loopback0C 192.168.1.0/24 is directly connected, Vlan1C 192.168.100.0/24 is directly connected, Vlan100backbone#
SWITCH13-> show ip route
+ = Equal cost multipath routes * = BFD Enabled static route Total 6 routes
Dest Address Subnet Mask Gateway Addr Age Protocol------------------+-----------------+-----------------+---------+----------- 10.1.12.0 255.255.255.0 10.1.12.13 26d 5h LOCAL 10.10.10.12 255.255.255.255 192.168.1.12 05:15:08 RIP 10.10.10.13 255.255.255.255 10.10.10.13 04:42:57 LOCAL 127.0.0.1 255.255.255.255 127.0.0.1 35d10h LOCAL 192.168.1.0 255.255.255.0 192.168.1.13 27d 1h LOCAL 192.168.13.0 255.255.255.0 192.168.13.13 26d 5h LOCAL
The CISCO 3560 is directly connected by a trunk on the Alcatel 6850 (SWITCH13), I can ping all vlan but the loopback, it's a routing problem?
Yes, that is correct. Your cisco switch does not know about the Alcatels loopbacks and they have no knowledge of his. Looks like your common vlan between the switches is vlan 1. On the 3560 you could enable rip routing add vlan 1 (192.168.1.0/24) and add your loopback to it in order to advertise it out and learn about the Alcatels loopbacks. There are other ways using static routing but they would require more of an explanation.
Host networks /32 need to be advertised.
Thank you for this explanation, I begin to understand.
I don't want to enable the RIP on the 3560, I prefer to use a static route and I have a problem with that.
If I'm not saying stupidity, loopback0 10.10.10.1/32 on 3560 is directly connected the loopback0 10.10.10.13/32 of Alcatel 6850 (SWITCH13), I can understand that is not possible from 3560 to ping the loopback 10.10.10.12/32 of Alcatel 6850 (SWITCH12) but why I can not ping the loopback0 10.10.10.13/32 directly connected?
If I add a static route on the 3560 which gateway? 10.10.10.13? This address is not reachable.
From the 3560 you can see in the route table that is doesn't know about that 10.10.10.13/32 address. So when you ping 10.10.10.13 from your 3560 it has no idea where to send traffic. Now if you have a vlan that is common between the two switches (Vlan1), and if they both have interfaces in that vlan you could point static routes to each others loopbacks with the next hop of those vlan 1 interfaces.
Does that help?
Todd, many and many thank again.
I have add these two route on the 3560
ip route 10.10.10.12 255.255.255.255 192.168.1.13
ip route 10.10.10.13 255.255.255.255 192.168.1.13
Now, everything works perfectly.