The host routes are advertised as long as they fulfill the follwing requirement. In the case the mask on the interface is /30, host routes under the same major net are advertised if the host bits are not all zero. In this case 10.10.10.20 and 10.10.10.88 have their host bits all zero if you apply a 30 bit mask. 10.10.10.22 and 10.10.10.90 for instance would be advertised. The rule is just so there is no confusion between a host and a subnet route (IE: 10.10.10.20/30 and 10.10.10.20/32).
You can apply the same rule for when the interface is configured with a /24 and will see why the two hosts routes are advertised in this case.
Obviously, RIPv2 doesn't have that restriction since it carries subnet mask information in the update message.
Hope this helps,
Harold Ritter Sr. Technical Leader CCIE 4168 (R&S, SP) firstname.lastname@example.org México móvil: +52 1 55 8312 4915 Cisco México Paseo de la Reforma 222 Piso 19 Cuauhtémoc, Juárez Ciudad de México, 06600 México
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