OAM Router

[sugunthan]

Hi guys.

I am still new in this, can any1 help me please!!!


I have 2x OAM link's (VC32 n VC33) connecting to NodeB, RNC, via ATMCC.

For eg:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Scenario#1 - NodeB

When the 1st link (VC32) goes down, the traffic is not routed via 2nd link (VC33).
After further investigation, notice the route to (NodeB_IP) still active on 1st link(VC32) of Router.
VC32 ATM interface is UP. Ping to destination fails.

Conclusion:
1) When the ATM port (VC32) on Cisco Router is shut manually, the connection to NodeB recovers.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Scenario#2 - NodeB

When the 1st link (VC32) goes down, the traffic is not routed via 2nd link (VC33).
After further investigation, notice the route to (NodeB_IP) still active on 1st link(VC32) of Router.
VC32 ATM interface is UP. Ping to destination fails.

Conclusion:
1) When the ATM port (VC32) on Cisco Router is shut manually, the connection to NodeB does not recover.
2) Notice the IP routing on NodeB is wrong, after ammending the changes the link recovered on (VC33) since (VC32 still down).

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Scenario#3 - RNC

When the 1st link (VC32) goes down, the traffic is not routed via 2nd link (VC33).
After further investigation, notice the route to (RNC) still active on 1st link(VC32) of Router.
VC32 ATM interface is UP. Ping to destination fails.

Conclusion:
1) After deleting the (VC32) on ATMCC, the connection via (VC32) to RNC did not recover.
2) When the ATM port (VC32) on Cisco Router is shut manually, the connection to RNC recovers.

Note:
#1 The routing protocol in used is static, VC32 has metric 0 and VC32 as metric 5.
#2 Cisco Router (cisco 7206VXR) is used.
#3 25 RNC
#4 5000 over NodeB's (some using IPRAN and some using ATM)
#5 Only 5 OAM router's available in network
#6 Scenario#2 is not neccessary, but just sharing.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Question#1 (Refer to Scenario #1)
Why when the NodeB is down on (VC32), router does not route traffic via (VC33)?

Question#2 (Refer to Scenario #3)
Why when the RNC is down on (VC32), router does not route traffic via (VC33)?

Question#3
If I were do deploy other routing protocols (BGP or EIGRP) to replace the static route.
Which routing protocols is highly recommended.

[wernfried]

Do you get anything different when you enable "continuityCheck" at VpcTp or Aal5TpVccTp?

Kind Regars

[sugunthan]

Do you get anything different when you enable "continuityCheck" at VpcTp or Aal5TpVccTp?

Kind Regars

currently it's FALSE.

From ALEX:
continuityCheck = falseSpecifies whether VC end-to-end continuity check is active.
It should be on false/true ???

Btw, tested on few RNC, only 1 RNC (VC33) link came UP immediately. The rest RNC had to shutdown the router interface.
All RNC had the continuityCheck=false.

[consultant]

currently it's FALSE.

From ALEX:
continuityCheck = falseSpecifies whether VC end-to-end continuity check is active.
It should be on false/true ???

Btw, tested on few RNC, only 1 RNC (VC33) link came UP immediately. The rest RNC had to shutdown the router interface.
All RNC had the continuityCheck=false.

continuityCheck have to be enabled on all vpcTp links, on the Cisco router, RNC to router ATM VP interface and RNC to RBS ATM VP interface.
You should also enable IpAtmLink monitor and change IpAtmLink values of monitorInterval and monitorRetries /for more info check mom IpAtmlink/
set Ip=1,IpAtmLink monitor true
example
set IpAtmLink monitorInterval 20
set IpAtmLink monitorRetries 20

Hope that will help you

BR

[sugunthan]

ATMLink monitor is enabled.

monitor true
monitorInterval 10
monitorRetries 10


Btw, identified the root cause.

After adding the following configuration on Router, problem solved.

oam-pvc manage

oam retry 3 3 1


Thanks to all.

-/sugu