cidrv6Merge - mod.ts - @hertzg/ip documentation

function cidrv6Merge



cidrv6Merge(cidrs: readonly Cidrv6[]): Cidrv6[]

Merges IPv6 CIDR blocks into the minimal covering set.

Takes an array of possibly overlapping, adjacent, or redundant CIDR blocks and returns the minimal set of non-overlapping CIDR prefix blocks covering the exact same address space.

The result matches the dialect of the inputs. When they disagree, it is in MaskedCidrv6 form (ADR 0006).

Examples

Compact adjacent allocations

import { assertEquals } from "@std/assert";
import { cidrv6Merge, parseCidrv6, stringifyCidrv6 } from "@hertzg/ip/cidrv6";

const blocks = [
  parseCidrv6("2001:db8::/33"),
  parseCidrv6("2001:db8:8000::/33"),
];
assertEquals(cidrv6Merge(blocks).map(stringifyCidrv6), ["2001:db8::/32"]);

Remove contained and merge siblings

import { assertEquals } from "@std/assert";
import { cidrv6Merge, parseCidrv6, stringifyCidrv6 } from "@hertzg/ip/cidrv6";

const blocks = [
  parseCidrv6("2001:db8::/32"),
  parseCidrv6("2001:db8:1::/48"),
];
assertEquals(cidrv6Merge(blocks).map(stringifyCidrv6), ["2001:db8::/32"]);

Masked blocks merge to masked blocks

import { assertEquals } from "@std/assert";
import { cidrv6Merge, stringifyCidrv6 } from "@hertzg/ip/cidrv6";

const mask = 0xFFFFFFFF800000000000000000000000n;
const halves = [
  { address: 0x20010db8n << 96n, mask },
  { address: 0x20010db88000n << 80n, mask },
];
assertEquals(cidrv6Merge(halves).map(stringifyCidrv6), ["2001:db8::/ffff:ffff::"]);

Parameters



cidrs: readonly Cidrv6[]

The CIDR blocks to merge

Return Type

Cidrv6[]

Minimal set of non-overlapping CIDR blocks, sorted by address