A routing loop occurs after routes are summarized on an AR2240

Root cause: On the live network, whether packets sent from Router2 to through Router1 or ME60B depends on the 24GE card connected between Router1 and Router2. The 24GE card is the high-end LAN card that provides the route forwarding function (enabled by default), but cannot download a complete IP routing table. Router1 learns routes to through OSPF. When packets reach Router1, Router1 sends the packets to Router2, causing a loop. To eliminate the loop, disable the route forwarding function of the high-end LAN card. Subsequently, packets received by the high-end LAN card are sent to the sub-core CPU for forwarding.
Run the set workmode lan-card l3centralize command in the system view to disable the route forwarding function of high-end LAN card. In this case, Router2 can ping successfully.
1. Check route table and forwarding entries.
2. Perform tracert starting from R3.
3. Run the display traffic policy statistics interface interface-type interface-number { inbound | outbound } command on R1 and R2 respectively to collect traffic statistics on the interfaces that connect R1 and R2.
For details, see A Routing Loop Occurs After Routes Are Summarized on an AR2240.

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