I am testing in a lab and my question is: When I inject a specific route (subnet) into the BGP via the network command with auto-summary disabled, the Next hop to that subnet appears as 0.0.0.0, so the BGP router itself. However, when I disable suto-summary, the Next hop changes to the router within my AS which is the actual gateway into the subnet
RTA#sh ip bgp 18.104.22.168
BGP routing table entry for 22.214.171.124/24, version 132
Paths: (1 available, best #1, table Default-IP-Routing-Table)
BGP speakers do not advertise prefix if there not found in/knowed by IGP. If the specific route is known by IGP and the network statement in BGP is configure (with auto-sum enabled) it will: Summarizes subprefixes to the classful network boundary when crossing classful network boundaries. (with auto-sum disabled): By default, BGP does not accept subnets redistributed from Interior Gateway Protocol (IGP). To advertise and carry subnet routes in BGP, use no auto-summary command.
All can ofcourse depend on how your other BGP speakers are configured with syncronization and auto-summary and your IGP.
Thanks for zour reply! Anyway, I am aware of how auto-summary works in BGP, I am just a bit confised why the Next hop of a subnet configured with network command (auto-summary enanled) is 0.0.0.0 (the local router), but WHY is changes to the actual IGP Next hop with auto-summary DISabled...Can you help with this one?
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
login w/ SSH 1 or 2 to the device compare to IOS device. After
investigation, the there is 1s delay between the client KEXDH_INIT and
the server (XR) KEXDH_REPLY. After debug ssh serv...
Introduction The purpose of this document is to demonstrate the Open
Shortest Path First (OSPF) behavior when the V-bit (Virtual-link bit) is
present in a non-backbone area. The V-bit is signaled in Type-1 LSA only
if the router is the endpoint of one or ...
Hi, I am seeing quite a few issues with patch install and wanted to
share my experience and workaround to this. Login to admin via CLI, then
access root with the “shell” command Issue “df –h” and you’ll probably
see the following directory full or nearly ...