Unicast traffic on Inactive server

Unanswered Question
Aug 19th, 2007

Some client traffic is seen being received at the DR site when the traffic is

supposed to be received only at the Primary site being the currently active

site.

BACKGROUND:

1. The customer has two data centers (see attached file HA.PPT), one is called

the Primary Site and the second one is called the DR Site. The current state is

that the former is active while the latter is inactive. The Primary Site, being

the active one is expected to have the traffic for the users. On the other

hand, the DR is inactive and no client traffic is expected to be visible there

but then there are client traffic that are appearing to be recieved at this

end.

2. The Primary Site and the DR site is connected to different switches (all are

WS-C6509-E), but both sites are sitting in the same subnet 10.51.22.0/24. The

clients who are accessing the servers are sitting at the subnet 10.51.22.0/24.

(see attached file HA.PPT)

3. There is a virtual IP (logical IP) that is attached to the servers at the

active site (active site is currently the Primary Site). In the event of

failover, from Primary Site to DR Site, the activation is being done by manual

intervention, that is, the virtual IP is going to be deactivated at the Primary

Site and then to be activated at the DR Site. Only then the DR Site is expected

to have the client traffic.

4. The servers, either at the Primary Site or DR Site, is running on Solaris 9,

with Oracle Rac 9.2.0.8.

5. The clients are running on Solaris 9 with Weblogic as Oracle client.

6. Attached is the traffic capture taken from one of the servers at the DR

Site.

7. Attached is the show-tech from the Cisco Catalyst switches.

QUESTIONS:

1. Considering that the DR site is inactive, it is surprising to see that

client traffic is being received at this end. Any explanation on this? This

situation is causing slow response on the application.

2. Is there anything wrong in the configuration of the L2/L3 switches?

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nambi_gct Mon, 08/20/2007 - 05:36

Do you see any asymmetric routing.Please track the return path.It could be that one of the switches flood the traffic due to missing entry in the CAM table.If so you need to tune the ARP time out value.

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