Routing & Switching H12-261_V3.0 Huawei Study Notes

MP-EGP by MP_REACH_NLRI and IP_UNREACH_NLRI Two attributes to advertise VPNv4 routing

MP-BGP The required message is quasi-VP type N, v4VP route N is distributed by v4 distribution and privately issued network label policy label slightly with BGP-4 same

When the PE and CE exchange routes through BGP, a BGP process needs to be created on the CE for each VPN instance

Route- The filtering relationship between the nodes of the Policy is"Or", that is, as long as it passes the filtering of a node, it can pass the Route- Policy.

For locally advertised routes, configure routing policies, which take effect before adding routes to the BGP routing table.

In the same node of Route-Policy, multiple if-match clauses for different attributes are "or" relationship.

on receivingBGPWhen routing peers, implement routing policies to filter unnecessary BGP routes, and these routes will not be added to the local BGP routing table.

Open Notepad, enter undo debugging all, copy the command line, paste it into the Monitor interface

Exit the current Monitor interface, re-SSH into the device to open a new Monitor interface

Open Notepad, enter undo terminal debugging, copy the command line, and paste it into the Monitor interface

Open Notepad, enter undo terminal monitor, copy the line command, and paste it into the Monitor interface

In the case of CE multi-homing, enabling the BGP AS number replacement function may cause routing loops. BGP So can be used to prevent routing loops in VPN sites.

When BGP is used to exchange routing information between PE and CE, if the autonomous systems where the two VPN sites are located use the same private AS number, the AS number replacement function can be used to replace the received AS number with any specified AS number. The As number in the private network route, to prevent the route from being discarded due to repeated AS numbers

When BGP is used to exchange routing information between PE and CE, there is no need to import private network routes into BGP on PE.

In the Hub & Spoke scenario, when Hub-CE and Hub-PE use IGP, Spoke-PE and Spoke-CE cannot use EBGP