HP 5500 Ei 5500 Si Switch Series Configuration Guide

 225 
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter BGP view. 
bgp as-number   N/A 
3.  Enter IPv4 MBGP address 
family view.  ipv4-family multicast 
N/A 
4.  Advertise a default route to an 
MBGP peer or peer group.  peer { group-name |
 ip-address } 
default-route-advertise 
[ route-policy  route-policy-name ]  Not advertised by default. 
 
 
NOTE: 
With the peer  default-route-advertise  command executed, the router sends a default route with the next
hop as itself to the...

 226 
Step Command Remarks 
4.  Configure BGP route 
distribution filtering policies. 
• Configure the filtering of redistributed 
routes:  
filter-policy  { acl-number  |  ip-prefix  
ip-prefix-name  }  export [ direct |  isis 
process-id  | ospf process-id  | rip 
process-id  | static ] 
• Apply a routing policy to 
advertisements to an IPv4 MBGP peer 
or a peer group:  
peer {  group-name  | peer-address  } 
route-policy  route -policy-name  export
 
•  Reference an ACL to filter 
advertisements to an...

 227 
Step Command Remarks 
4.  Configure MBGP route 
reception filtering policies. 
• Filter incoming routes using an 
ACL or IP prefix list: 
filter-policy  { acl-number  | 
ip-prefix  ip-prefix-name  } 
import  
• Reference a routing policy to 
routes from an IPv4 MBGP peer 
or a peer group: 
peer { group-name  | 
ip-address  } route-policy  
policy-name  import  
• Reference an ACL to filter 
routing information from an 
IPv4 MBGP peer or a peer 
group: 
peer { group-name  | 
ip-address  }...

 228 
Step Command Remarks 
4.  Configure BGP route 
dampening parameters.  dampening
 [ half-life-reachable 
half-life-unreachable reuse 
suppress ceiling  | route-policy  
route-policy-name  ] *  Not configured by default. 
 
Configuring MBGP route attributes 
You can modify MBGP route attributes to affect route selection. 
Configuration prerequisites 
Before you configure this task, you need to configure basic MBGP functions. 
Configuring MBGP route preferences 
You can reference a routing policy to...

 229 
Configuring the MED attribute 
When other conditions of routes to a destination are identical, the route with the smallest MED is 
selected. 
To configure the MED attribute: 
 
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter BGP view. 
bgp as-number   N/A 
3.  Enter IPv4 MBGP address 
family view.  ipv4-family multicast 
N/A 
4.  Configure the default MED 
value.  default med 
med-value  Optional. 
0 by default. 
5.
  Enable the comparison of the 
MED of routes from...

 230 
Configuring the AS-PATH attributes 
In general, MBGP checks whether the AS-PATH attribute of a route from a peer contains the local AS 
number. If it does, it discards the route to avoid routing loops. 
To configure the AS-PATH attributes: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Enter BGP view. 
bgp as-number   N/A 
3.  Enter IPv4 MBGP address 
family view.  ipv4-family multicast 
N/A 
4.  Allow the local AS number to 
appear in the AS-PATH of 
routes from a peer or...

 231 
to the router after receiving the message. Therefore, the local router can perform dynamic route update 
and apply the new policy without terminating MBGP connections. 
To perform soft reset through route refresh: 
 
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter BGP view. 
bgp as-number   N/A 
3.  Enable BGP route refresh for a 
peer or a peer group.  peer { group-name
 | ip-address } 
capability-advertise  route-refresh  Optional. 
Enabled by default. 
 
Performing soft...

 232 
the negotiation process and establishing the neighboring relationship, the BGP router and its BGP peer 
can exchange ORF information through specific route-refresh messages.  
For the parameters configured on both si des for ORF capability negotiation, see Tabl e  7. 
T

o enable the MBGP ORF capability:  
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Enter BGP view. 
bgp as-number   N/A 
3.  Enable BGP route refresh for a 
peer or a peer group.  peer { group-name
 |...

 233 
Step Command Remarks 
1.  Enter system view. 
system-view N/A 
2.  Enter BGP view. 
bgp as-number   N/A 
3.  Enter IPv4 MBGP address 
family view.  ipv4-family multicast
 N/A 
4.  Configure the maximum 
number of MBGP routes for 
load balancing.  balance 
number  Not configured by default. 
 
Configuring a large scale MBGP network 
Configuration prerequisites 
Before you configure this task, you must make peering nodes accessible to each other at the network 
layer. 
Configuring IPv4 MBGP peer...

 234 
Configuring MBGP community 
The community attribute can be advertised between MBGP peers in different ASs. Routers in the same 
community share the same policy. 
You can reference a routing policy to modify the community attribute for routes sent to a peer. In addition, 
you can define extended community attributes as needed. 
When you configure MBGP community, you must reference a routing policy to define the specific 
community attributes, and apply the routing policy for route advertisement. For...