The role of no auto summary--Learning Notes

In the RIPV2 version, for example, R1 now has a 10.1.1.2/24 route, if the RIPv2 version of the No auto-summary, then RIPv2 in the transmission of this route will be 10.1.1.0/24 out;

If the auto-summary is not turned off, it will be routed in 10.0.0.0/8 form.

To be direct, auto-summary means summarizing the main class boundaries, 10.0.0.0/8 or 172.16.0.0/16 or 192.168.1.0/24, but if auto-summarization is turned off, it can be sent by the mask of the route.

Generally we recommend no auto-summary, as this allows for precise lookups.

Some routers in Cisco routers default to No auto-summary, some with manual, which is related to iOS.

There is no point in the RIPV1 version of no auto-sunmmary, even if you hit no auto-summary is useless, because RIPV1 originally does not support turning off auto-summarization. The reason is that there is no field in the RIPV1 version of the packet that identifies the mask, so the RIPV1 version is meaningless even if you no auto-summary

No auto summary-Learning notes