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Cisco Bug: CSCsz39048 - tunnel_ea should propogate error to improxy when hfrpm call fails

Last Modified

May 15, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

3.0.0.BASE

Description (partial)

Symptom:

This problem occurs at LC boot time but may not manifest until later, when tunnel is put into service.  At boot time the following message is a indicator that the hfrpm process failed to respond within the retry period (1 minute).

%PKT_INFRA-tunnel_ea-3-PLATFORM_MANAGER_ERROR : Platform Manger returned the error Resource temporarily unavailable, for interface tunnel-te37 handle 0x080009a0

Later the missing platform entry could cause other components to fail.  Example: FIB call to add tunnel stats pointer for a fib entry that should traverse tunnel fails as follows. 

LC/1/6/CPU0:Apr 29 22:59:05.130 : fib_mgr[132]: %FORWARDING-FIB-3-PD_FAIL : fib_ldi_platform_update 906: PD action CREATE failed for passed_ldi 0x7bb3897c type DATA_TYPE_LDI_LW flags 0x0. Shared LDI 0x7bda0270 num_slots 1 num_buckets 1 depth 1 ldi type 6 ldi protocol mpls flags 0x101000  : 0x2 No such file or directory   : pkg/bin/fib_mgr : (PID=94293) : 
-Traceback= 48270c30 4824780c 48248488 48295518 48296f64 4824866c 4824a044 4824f8cc 48250564 4829889c 48298c94 4820518c fc1662b4 fc164730 48200d78 4820cadc

Conditions:

This problem only occurs if the platform code returns an error during interface creation. The call is retried for up to a minute so if the platform process recovers in that period then there will be no issue. The only way this problem can occur is if the platform process remains unavailable for more than a minute. This cannot happen during ordinary operation and as such this is a second-order failure - there must already be some fault for this issue to be seen.
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