d19d1dd569
**- Why I did it** I was asked to change "Allow list" prefix-list generation rule. Previously we generated the rules using following method: ``` For each {prefix}/{masklen} we would generate the prefix-rule permit {prefix}/{masklen} ge {masklen}+1 Example: Prefix 1.2.3.4/24 would have following prefix-list entry generated permit 1.2.3.4/24 ge 23 ``` But we discovered the old rule doesn't work for all cases we have. So we introduced the new rule: ``` For ipv4 entry, For mask < 32 , we will add ‘le 32’ to cover all prefix masks to be sent by T0 For mask =32 , we will not add any ‘le mask’ For ipv6 entry, we will add le 128 to cover all the prefix mask to be sent by T0 For mask < 128 , we will add ‘le 128’ to cover all prefix masks to be sent by T0 For mask = 128 , we will not add any ‘le mask’ ``` **- How I did it** I change prefix-list entry generation function. Also I introduced a test for the changed function. **- How to verify it** 1. Build an image and put it on your dut. 2. Create a file test_schema.conf with the test configuration ``` { "BGP_ALLOWED_PREFIXES": { "DEPLOYMENT_ID|0|1010:1010": { "prefixes_v4": [ "10.20.0.0/16", "10.50.1.0/29" ], "prefixes_v6": [ "fc01:10::/64", "fc02:20::/64" ] }, "DEPLOYMENT_ID|0": { "prefixes_v4": [ "10.20.0.0/16", "10.50.1.0/29" ], "prefixes_v6": [ "fc01:10::/64", "fc02:20::/64" ] } } } ``` 3. Apply the configuration by command ``` sonic-cfggen -j test_schema.conf --write-to-db ``` 4. Check that your bgp configuration has following prefix-list entries: ``` admin@str-s6100-acs-1:~$ show runningconfiguration bgp | grep PL_ALLOW ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_1010:1010_V4 seq 10 deny 0.0.0.0/0 le 17 ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_1010:1010_V4 seq 20 permit 127.0.0.1/32 ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_1010:1010_V4 seq 30 permit 10.20.0.0/16 le 32 ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_1010:1010_V4 seq 40 permit 10.50.1.0/29 le 32 ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_empty_V4 seq 10 deny 0.0.0.0/0 le 17 ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_empty_V4 seq 20 permit 127.0.0.1/32 ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_empty_V4 seq 30 permit 10.20.0.0/16 le 32 ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_empty_V4 seq 40 permit 10.50.1.0/29 le 32 ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_1010:1010_V6 seq 10 deny ::/0 le 59 ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_1010:1010_V6 seq 20 deny ::/0 ge 65 ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_1010:1010_V6 seq 30 permit fc01:10::/64 le 128 ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_1010:1010_V6 seq 40 permit fc02:20::/64 le 128 ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_empty_V6 seq 10 deny ::/0 le 59 ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_empty_V6 seq 20 deny ::/0 ge 65 ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_empty_V6 seq 30 permit fc01:10::/64 le 128 ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_0_COMMUNITY_empty_V6 seq 40 permit fc02:20::/64 le 128 ``` Co-authored-by: Pavel Shirshov <pavel.contrib@gmail.com> |
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