3com 3031 Instruccion De Instalación
652
C
HAPTER
50: MBGP M
ULTICAST
E
XTENSION
C
ONFIGURATION
Configuring the MED
Value for an AS
The MED configured in BGP view is valid for both unicast and multicast.
For this configuration, refer to Chapter 42“BGP Configuration” .
Comparing MED Values
from Different AS
Neighbor Paths
Do not use this configuration unless are sure that different ASs adopt the same
IGP and route selection method. The configuration in BGP view works both in
unicast and multicast.
IGP and route selection method. The configuration in BGP view works both in
unicast and multicast.
For the configuration, refer to Chapter 42“BGP Configuration” .
Configuring Local
Preference
Different local preference can be configured as a reference of the MBGP routie
selection. When an MBGP router has multiple routes to the same destination
through different next hop neighbors, it will select the route with the highest local
preference.
selection. When an MBGP router has multiple routes to the same destination
through different next hop neighbors, it will select the route with the highest local
preference.
The configuration works both in unicast and multicast.
For this configuration, refer to Chapter 42“BGP Configuration” ..
Configuring MBGP Timer
After a router establishes MBGP connection with a peer, it sends Keepalive
messagess to the peer periodically to check for the smooth connection. If the
router does not receive a single Keepalive message or any other kind of message
from the peer within the defined connection Holdtime, it will think the MBGP
connection broken and exit, and will process the routing information received
through this connection as appropriate. Therefore, the iKeepalive message
sending interval and MBGP connection Holdtime are two important parameters in
MBGP mechanism.
messagess to the peer periodically to check for the smooth connection. If the
router does not receive a single Keepalive message or any other kind of message
from the peer within the defined connection Holdtime, it will think the MBGP
connection broken and exit, and will process the routing information received
through this connection as appropriate. Therefore, the iKeepalive message
sending interval and MBGP connection Holdtime are two important parameters in
MBGP mechanism.
The configuration works both in unicast and multicast.
For this configuration, refer to Chapter 42“BGP Configuration” .
Configuring MBGP
Peer/Peer Group
The use of MBGP peer groups is to simplify configuration. When multiple peers
with the same configuration are necessary. You can create and configure a peer
group first and then you add the peers into the group, since all peers in a group
have the same configuration within the group.
with the same configuration are necessary. You can create and configure a peer
group first and then you add the peers into the group, since all peers in a group
have the same configuration within the group.
CAUTION: Configure the peer group under the guide of technical support
engineers.
engineers.
Perform the following configuration in IPv4 multicast sub-address family view.
Creating a peer group with members
By default, an IBGP peer will be added to a default peer group without
configuration. Such default group is invisible. The configuration of the route
updating policy on any IBGP peer is valid for other the IBGP group members only.
If the router is not a route reflector, all the IBGP peers belong to the same group.
Otherwise, all the route reflection clients belong to one group, and others to
another group.
configuration. Such default group is invisible. The configuration of the route
updating policy on any IBGP peer is valid for other the IBGP group members only.
If the router is not a route reflector, all the IBGP peers belong to the same group.
Otherwise, all the route reflection clients belong to one group, and others to
another group.
EBGP peer group members must be in the same network segment. Otherwise, the
route updating packets sent from a router might be discarded by some EBGP
peers.
route updating packets sent from a router might be discarded by some EBGP
peers.