Trying to set embedded-service-engine IP add, says it overlaps.

cinmachina · ‎01-30-2013

Hi all,

I'm configuring my very first 2nd Generation 2901 Cisco ISR, and trying to set it up with CIMC-E. However, when I set up an IP address of 10.5.128.200 for the embedded-services-engine0/0 interface, it returns this error:

% 10.5.128.0 overlaps with GigabitEthernet0/0.128

Here is the embedded service engine interface config:

interface Embedded-Service-Engine0/0

ip address 10.5.128.200 255.255.255.0

shutdown

service-module ip address 10.5.128.201 255.255.255.0

service-module ip default-gateway 10.5.128.1

end

Here is the config of gi0/0.128

interface GigabitEthernet0/0.128

description cadiz-data

encapsulation dot1Q 128

ip address 10.5.128.1 255.255.255.0

ip helper-address 10.5.128.10

no ip proxy-arp

ip pim sparse-dense-mode

no ip route-cache

end

Any help would be greatly appreciated!

amikat · ‎01-31-2013

Hi,

The Service Module interfaces you are trying to configure should follow the basic addressing rule, ie. come from a different subnet with regards to other (routing) interfaces. This remains true even if these interfaces are internal (ie. invisible). So you should choose another subnet than 10.5.128.0/24 (and of course a different subnet than that used for other interface addesses). Within that choosen (new) subnet you can assign one address to the router side of the Service Module and another to the module side. Service Module default gateway address is the router side of the Service Module ip address under normal circumstances.

Having said that I feel a bit surprised that you are trying to configure CIMC-E. To my knowledge your box (Cisco 2901 router) can only house internal SRE module (ISM-SRE-300-K9) and according to Cisco Documentation CIMC-E is not supported on the ISM-SRE-300-K9.

Best regards,

Antonin

cinmachina · ‎02-05-2013

This router has sub-interfaces for the 128 - 135 networks.

Are you saying I have to place it on a different network than ALL of those? I'm confused. Can you help elaborate?

amikat · ‎02-05-2013

Hi,

Will you please try these commands:

interface Embedded-Service-Engine0/0

ip address 10.5.136.1 255.255.255.0

no shutdown

service-module ip address 10.5.136.2 255.255.255.0

service-module ip default-gateway 10.5.136.1

Best regards,

Antonin

cinmachina · ‎02-06-2013

I'm confused. Why would I give it an IP address of a network it doesn't know about?

Peter Paluch · ‎02-06-2013

Hello,

What Antonin is trying to explain you is that the Embedded-Service-Engine0/0 represents an internal connection to the CIMC module within the router itself. In other words the Em0/0 is an internal and standalone network interface that connects your router to the CIMC module. It is independent of the externally-accessible GigabitEthernet interfaces or any other network interfaces your router might have. The Em0/0 interface is not in any way tied or bridged to the Gi0/x interfaces, just like the Gi0/x interfaces are not tied or bridged to each other. The Em0/0 is basically a separate, individual point-to-point link inside your router that connects the router and the CIMC together and that needs to be addressed using a separate and unique network. Keep in mind that the CIMC is a separate and standalone device, not really a part of your router. Therefore, as Antonin suggested, the Em0/0 interface is placed into a unique non-overlapping subnet, while the CIMC is configured to have another IP address from the same subnet.

It is also not true that the router does not know about this network. This network will appear in the routing table as a directly connected network to the Em0/0 interface. You will have to make sure that this network is reachable by other stations that require communication with the CIMC - possibly by advertising this route in a routing protocol or by setting the devices to use your router as the default gateway.

Best regards,

Peter

amikat · ‎02-06-2013

Hi,

My approach was to use a separate subnet for the Service Module. Should you prefer to use the same subnet as one of your already configured subnets you have the option of configuring the "ip unnumbered" interface, e.g. you can alternatively try this configuration:

interface Embedded-Service-Engine0/0

ip unnumbered gigabitethernet 0/0.128

no shutdown

service-module ip address 10.5.128.201 255.255.255.0

service-module ip default-gateway 10.5.128.1

There are pros and cons of configuring either way.

Best regards,

Antonin

Trying to set embedded-service-engine IP add, says it overlaps. HELP!