The topology of some site is NE40-NE20-MA5200F.
Four address pools on MA5200F are ued for PPPOE users online. Four address pools are 10.1.1.0/22.
Roundtrip route of four address pools is configured on NE20 and the next-hop points to MA5200F. Enable four addresses on MA5200F and it is found that user of 10.1.1.0/24 cannot access network, but it can ping through 10.1.1.1 and connected address of MA5200F and NE20. It cannot ping through uplink address of NE20 and MA5200F. Users of other network segments can access network.
1. Check configuration of MA5200F and it is not problematic.
2. Check route configuration of NE20 and it is correct.
3. Check routing table of NE20 and it is found that there is one destination network segment 10.1.1.0/24 and the next-hop is direct route of E0/0/0.
4. Delete configured IP address on E0/0/0 interface and the service recovers.
Ethernet interfaceE0/0/0 of MPU of NE20 configures address 10.1.1.1/24 and attaches users. One destination network segment 10.1.1.0/24 is created on on NE20 and the next-hop is direct route of E0/0/0. The preference of the route is higher than roudtrip route of manually configured network segment 10.1.1.0/22.
Carefully check network data before construction.