Dell S4048T, Configuration Manual

Page: 658 / 1277

Example of Verifying the System is not Caching Remote Sources
As shown in the following example, R1 is advertising source 10.11.4.2. It is already in the SA cache of R3 when
an ingress SA filter is applied to R3. The entry remains in the SA cache until it expires and is
not stored in the
rejected SA cache.
[Router 3]
R3(conf)#do show run msdp
!
ip multicast-msdp
ip msdp peer 192.168.0.1 connect-source Loopback 0
ip msdp sa-filter in 192.168.0.1 list myremotefilter
R3(conf)#do show run acl
!
ip access-list extended myremotefilter
seq 5 deny ip host 239.0.0.1 host 10.11.4.2
R3(conf)#do show ip msdp sa-cache
MSDP Source-Active Cache - 1 entries
GroupAddr SourceAddr RPAddr LearnedFrom Expire UpTime
239.0.0.1 10.11.4.2 192.168.0.1 192.168.0.1 1 00:03:59
R3(conf)#do show ip msdp sa-cache
R3(conf)#
R3(conf)#do show ip msdp peer
Peer Addr: 192.168.0.1
Local Addr: 0.0.0.0(639) Connect Source: Lo 0
State: Listening Up/Down Time: 00:01:19
Timers: KeepAlive 30 sec, Hold time 75 sec
SourceActive packet count (in/out): 0/0
SAs learned from this peer: 0
SA Filtering:
Input (S,G) filter: myremotefilter
Output (S,G) filter: none
Preventing MSDP from Advertising a
Local Source
To prevent MSDP from advertising a local source, use the following command.
• Prevent an RP from advertising a source in the SA cache.
CONFIGURATION mode
ip msdp sa-filter list in peer list ext-acl
Example of Verifying the System is not Advertising Local Sources
In the following example, R1 stops advertising source 10.11.4.2. Because it is already in the SA cache of R3, the
entry remains there until it expires.
[Router 1]
R1(conf)#do show run msdp
!
ip multicast-msdp
ip msdp peer 192.168.0.3 connect-source Loopback 0
ip msdp sa-filter out 192.168.0.3 list mylocalfilter
R1(conf)#do show run acl
!
ip access-list extended mylocalfilter
Multicast Source Discovery Protocol (MSDP) 658