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Route Is Unreachable Due to Limited Routing Entries on the NP of the NE20E

Publication Date:  2013-09-03 Views:  35 Downloads:  0
Issue Description
Router of vendor C (GE1/0/1.27, 77.95.114.33) ----- (GE1/0/1.27, 77.95.114.34) NE20E at site A (GE1/0/1.5, 193.104.89.130) ------ (GE1/0/1.5, 193.104.89.129) NE20E at site B
Two NE20E routers at sites A and B are both of V200R005C03B581. The NE20Es at sites A and B obtain the route to 62.189.34.126, IP address of www.xxxx.com, from the router of vendor C.
The NE20E at site A can ping 62.189.34.126 from the source 193.104.89.130, but the NE20E at site B cannot ping 62.189.34.126 from the source 193.104.89.129. After the tracert 62.189.34.126 command is executed on the NE20E at site B, the command output shows that the NE20E can only ping 193.104.89.130 of the NE20E at site A.
Handling Process
1. Verify that no special configuration exists on the router of vendor C.
2. During the ping operation on the NE20E at site A, the NE20E sends host packets using the forwarding table on the main control board, not the network processor (NP). During the ping operation on the NE20E at site B, the NE20E at site A searches the NP forwarding table to forward packets for the NE20E at site B. The routing entry of 62.189.34.126 may exist only in the forwarding table on the main control board, not the NP. The main control board on the NE20E at site A has 300,000 routing entries, whereas the NP has only 51,200 routing entries.
3. Check FIB and NP routing entries on the NE20E at site A. The main control board has 300,000 routing entries, leading NP's failure to record all routing entries.
Root Cause
1. The NE20E at site A fails to forward ping packets sent from the NE20E at site B.
2. The router of vendor C is configured to allow an IP address to ping the extranet and prohibit a source IP address from pinging the extranet.
Solution
N/A

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