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Network Topology: Router 1 <---> Router 2
The customer has established IBGP peer between two NE20E routers Router 1 and Router 2 for test. On Router 1, LoopBack5 and LoopBack10 interfaces are configured and their /32 routes are imported into BGP routing-table by “network” commands:
ip address 192.168.223.100 255.255.255.255
ip address 10.1.1.1 255.255.255.255
peer 192.168.223.3 as-number 65534
network 10.1.1.1 255.255.255.255
network 192.168.223.100 255.255.255.255
supernet unicast advertise enable
peer 192.168.223.3 enable
peer 192.168.223.2 as-number 65534
supernet unicast advertise enable
peer 192.168.223.2 enable
peer 192.168.223.2 keep-all-routes
In the BGP routing table of Router 2 both prefixes for LoopBack ip addresses of Router 1 are received and valid:
BGP Local router ID is 192.168.223.3
Status codes: * - valid, > - best, d - damped, x - best external, a - add path,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V - valid, I - invalid, N - not-found
Total Number of Routes: 2
Network NextHop MED LocPrf PrefVal Path/Ogn
*>i 10.1.1.1/32 192.168.223.2 0 100 0 i
*>i 192.168.223.100/32 192.168.223.2 0 100 0 i
But only one prefix is being installed in the ip routing table:
display ip routing-table
Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route
Routing Table : _public_
Destinations : 8 Routes : 8
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.1.1.1/32 IBGP 255 0 RD 192.168.223.2 Eth-Trunk10.621
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
192.168.223.0/24 Direct 0 0 D 192.168.223.3 Eth-Trunk10.621
192.168.223.3/32 Direct 0 0 D 127.0.0.1 Eth-Trunk10.621
192.168.223.255/32 Direct 0 0 D 127.0.0.1 Eth-Trunk10.621
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
The customer asks why the second prefix (192.168.223.100/32) is not installed in the ip routing table.
1) Have checked the configuration is ok.
2) Search the product manual for relative issue and found BGP supernet route will not be installed in ip routing table.
192.168.223.100/32 is with next hop 192.168.223.2/24, so it is a BGP supernet route for R2. NE20E router will not install supernet into IP routing table. Any route that meets one of the following conditions is a BGP supernet route.
· If you perform bitwise AND operations on the destination address mask with the destination address and next hop address, respectively, the calculated network addresses are the same, and the destination address mask is greater than or equal to the next hop address mask.
· If you perform bitwise AND operations on the destination address mask with the destination address and next hop address, respectively, the calculated network addresses are different. However, if you perform bitwise AND operations on the next hop address mask with the destination address and next hop address, respectively, the calculated network addresses are the same.
Ask the customer to user other BGP none-supernet route for test.