Route Manager‘s Table When IP Route Sharing is Enabled shows how compression is applied for the nodes with ECMP table entries when IP route sharing is enabled. Sample routes with ECMP table entries are taken for illustration. The Reason field in the table provides information about why the compression is applied or not applied for the node.
| Prefix | Gateways | Compressed? | Reason |
|---|---|---|---|
| 20.0.0.0/8 | Gw1: 30.1.10.1, Gw2: 50.1.10.1 | NO | This is the top node. |
| 20.1.10.0/24 | Gw1: 30.1.10.1 | NO | Number of gateways did not match. This node has only one gateway, while the parent node has two. |
| 20.2.10.0/24 | Gw1: 30.1.10.1, Gw2: 60.1.10.1 | NO | Number of gateways match. But one of the ECMP paths (gateway 60.1.10.1) does not match with its parent‘s ECMP paths. |
| 20.3.10.0/24 | Gw1: 30.1.10.1, Gw2: 50.1.10.1 | YES | Number of gateways matches with its parent. Also all the gateways match with parent. |
| 20.4.10.0/24 | Gw1: 30.1.10.1, Gw2: 50.1.10.1 Gw3: 60.1.10.1 | NO | Number of gateways does not match with its parent. |
| 20.1.10.44/32 | Gw1: 30.1.10.1 Gw2: 50.1.10.1 | NO | Number of gateways did not match. [This node has ECMP table entries, but parent node 20.1.10.0 does not have an ECMP table entry.] |
HAL(TCAM)/Kernel Routing Table When IP Route Sharing is Enabled shows only uncompressed routes.
| Prefix | Gateway |
|---|---|
| 20.0.0.8/16 | Gw1: 30.1.10.1, Gw2: 50.1.10.1 |
| 20.1.10.0/24 | Gw1: 30.1.10.1 |
| 20.2.10.0/24 | Gw1: 30.1.10.1, Gw2: 60.1.10.1 |
| 20.4.10.0/24 | Gw1: 30.1.10.1, Gw2: 50.1.10.1 Gw3: 60.1.10.1 |
| 20.1.10.44/32 | Gw1: 30.1.10.1 Gw2: 50.1.10.1 |
Sample output is shown below:
* (debug) BD-12804.9 # enable iproute sharing * (debug) BD-12804.10 # show iproute Ori Destination Gateway Mtr Flags VLAN Duration #s Default Route 12.1.10.10 1 UG---S-um--f v1 0d:20h:1m:3s #s Default Route 12.1.10.12 1 UG---S-um--f v1 0d:19h:14m:58s #d 12.1.10.0/24 12.1.10.62 1 U------um--f v1 0d:20h:1m:3s d 16.1.10.0/24 16.1.10.62 1 -------um--- v16 0d:20h:1m:4s #d 22.1.10.0/24 22.1.10.62 1 U------um--f v2 0d:20h:1m:4s #s 33.33.33.0/24 12.1.10.25 1 UG---S-um--f v1 0d:20h:1m:3s #s 55.0.0.0/8 12.1.10.10 1 UG---S-um--f v1 0d:20h:1m:3s #s 55.0.0.0/8 22.1.10.33 1 UG---S-um--f v2 0d:20h:1m:3s #s 55.2.1.1/32 12.1.10.22 1 UG---S-um--f v1 0d:20h:1m:3s #s 55.5.5.1/32 12.1.10.44 1 UG---S-um--f v1 0d:20h:1m:3s #s 66.0.0.0/8 12.1.10.12 1 UG---S-um--f v1 0d:20h:1m:3s #s 66.0.0.0/16 12.1.10.12 1 UG---S-um--c v1 0d:20h:1m:3s #d 70.1.10.0/24 70.1.10.62 1 U------um--f v7 0d:20h:1m:4s #s 78.0.0.0/8 12.1.10.10 1 UG---S-um--f v1 0d:20h:1m:3s #s 79.0.0.0/8 12.1.10.10 1 UG---S-um--c v1 0d:20h:1m:3s #s 79.0.0.0/8 12.1.10.12 1 UG---S-um--c v1 0d:20h:1m:3s #s 80.0.0.0/8 12.1.10.10 1 UG---S-um--f v1 0d:20h:1m:3s #d 80.1.10.0/24 80.1.10.62 1 U------um--f v8 0d:20h:1m:4s #s 81.0.0.0/8 12.1.10.10 1 UG---S-um--f v1 0d:20h:1m:3s #s 81.0.0.0/8 12.1.10.12 1 UG---S-um--f v1 0d:20h:1m:3s #s 81.0.0.0/8 12.1.10.13 1 UG---S-um--f v1 0d:20h:1m:3s #s 82.0.0.0/8 12.1.10.10 1 UG---S-um--f v1 0d:20h:1m:3s #s 83.0.0.0/8 12.1.10.10 1 UG---S-um--f v1 0d:20h:1m:3s #d 91.1.10.0/24 91.1.10.62 1 U------um--f v9 0d:20h:1m:4s #d 92.1.10.0/24 92.1.10.62 1 U------um--f v10 0d:20h:1m:6s #d 93.1.10.0/24 93.1.10.62 1 U------um--f v11 0d:20h:1m:6s Origin(Ori): (b) BlackHole, (be) EBGP, (bg) BGP, (bi) IBGP, (bo) BOOTP (ct) CBT, (d) Direct, (df) DownIF, (dv) DVMRP, (e1) ISISL1Ext (e2) ISISL2Ext, (h) Hardcoded, (i) ICMP, (i1) ISISL1 (i2) ISISL2 (is) ISIS, (mb) MBGP, (mbe) MBGPExt, (mbi) MBGPInter, (mp) MPLS Lsp (mo) MOSPF (o) OSPF, (o1) OSPFExt1, (o2) OSPFExt2 (oa) OSPFIntra, (oe) OSPFAsExt, (or) OSPFInter, (pd) PIM-DM, (ps) PIM-SM (r) RIP, (ra) RtAdvrt, (s) Static, (sv) SLB_VIP, (un) UnKnown (*) Preferred unicast route (@) Preferred multicast route (#) Preferred unicast and multicast route Flags: (B) BlackHole, (D) Dynamic, (G) Gateway, (H) Host Route (L) Matching LDP LSP, (l) Calculated LDP LSP, (m) Multicast (P) LPM-routing, (R) Modified, (S) Static, (s) Static LSP (T) Matching RSVP-TE LSP, (t) Calculated RSVP-TE LSP, (u) Unicast, (U) Up (f) Provided to FIB (c) Compressed Route Mask distribution: 2 default routes 12 routes at length 8 1 routes at length 16 9 routes at length 24 2 routes at length 32 Route Origin distribution: 8 routes from Direct 18 routes from Static Total number of routes = 26 Total number of compressed routes = 3