Some questions regarding using the SRE

[Devake666]

Dear All,

I'm  considering to monitor some packet traffic as well as detecting any  router issues with a customized application deployed on a SRE module on a  ISR G2. However i'm still not quite sure about the following issues:

1,  Will it be possible to send the traffic to the other router ports as  well as the SRE module via the MGF? I will need to send the traffic to  the application on the SRE and also to any devices connected to the  router.

2, Is it possible to throw SNMP traps to the SRE on the router via MGF?

3,  Other than using addition CPU resources, are there any other  differences between using a ESM and not using a ESM to access the SRE?

Any help is deeply appreciated.

Regards,

Angus

[agurtu · Accepted solution]

1. Once the packet hits MGF (switch) the packet will be seen across switched interface provided they are not in different vlan segments. MGF doesn't send packets to routed ports unless the packets are originated from devices connected to SRE or EHIWC or Etherswitch modules.

2. Yes. I think you mean sending traps to SRE via MFG.

3. You dont need ESM to access SRE. SRE is access via MGF, i.e. the packet destined to it is received by the router then sent to MGF then forwarded to SRE. ESM or EHWICs are used to provide high speed packet flow between LAN and application running on SRE without impacting the router. You can connected a routed port to an external switch and it will still work but in that case for every packet router's CPU will get involved.

In all scenarios I am assuming that the applciation you are running on SRE is SRE-V i..e. VMware Hypervisor.

[Devake666]

Thanks for the reply Aqurtu!

Yes i'm planning to use the SRE-V so this is entirely relevant. Below are some more questions regarding your reply.

1, So suppose a broadcasted packet reaches one of the integrated RJ-45 ports on a 2911 ISR G2, will it be possible to configure the router so that the other integrated RJ-45 ports, ESM/EHWIC modules installed on the router, as well as the SRE also recieve the packet? Technically, the router should act similar to a switch with the SRE behaving similar to an external machine connected to the switch via the MGF and other machine connected to the ports of the switch.

2, What if the trap was generated from the same router with the target SRE module installed? Will be possible to send the trap from the router via the MGF to the SRE installed on the router?