Enterasys Networks X-Pedition XSR CLI - Manual (Page 316)

BGP Set Commands
6-120 Configuring the Border Gateway Protocol
Mode
Route‐map configuration: XSR(config-route-map)#
Default
The dynamically‐learned metric value.
Example
The following example displays how the set metric command is used to update the value of the
MED value for BGP routes that are advertised to an external neighbor:
XSR(config)#access-list 66 permit 10.0.0.0 255.0.0.0
XSR(config)#route-map 1 permit 1
XSR(config-route-map)#match ip address 66
XSR(config-route-map)#set metric 20
XSR(config-route-map)#exit
XSR(config)#route-map 1 permit 2
XSR(config-route-map)#set metric 30
XSR(config-route-map)#exit
XSR(config)#router bgp 100
XSR(config-router)#neighbor 192.168.1.1 remote-as 101
XSR(config-router)#neighbor 192.168.1.1 route-map 1 out
The set metric command is used to change the value of the MED, which impacts the flow of
inbound traffic into a multi‐homed AS. All of the outbound updates leaving this router and
matching ACL 66 will have MED value of 20 assigned to them. All of the remaining updates will
have the MED value of 30. A lower value of MED is preferred in the BGP route selection process.
set origin
This command assigns a value to the origin attribute in the BGP routing update message which
impacts BGP route selection. Ensure that a match clause has been specified.
This attribute indicates where a routing update is derived. BGP prefers routes with the lowest
origin type: IGP is preferred over EGP and EGP is preferred over incomplete.
Syntax
set origin {igp | egp | incomplete}
Syntax of the “no” Form
The no form of this command removes BGP origin coding:
no set origin {igp | egp | incomplete}
igp Sets BGP origin code to Interior Gateway Protocol (IGP).
egp Sets BGP origin code to Exterior Gateway Protocol (EGP).
incomplete Sets BGP origin code to unknown.