Title

The RUCKUS ICX Multicast Source Discovery Protocol (MSDP) Router must be configured to use its loopback address when originating MSDP traffic. (Cat III impact)

Discussion

Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability of MSDP routers. It is easier to construct appropriate ingress filters for router management plane traffic destined to the network management subnet since the source addresses will be from the range used for loopback interfaces instead of a larger range of addresses used for physical interfaces. Log information recorded by authentication and syslog servers will record the router's loopback address instead of the numerous physical interface addresses.

Check Content

Review configuration to verify that MSDP uses a loopback address as its source. interface loopback 1 ip address x.x.x.x 255.255.255.255 ! router msdp msdp-peer x.x.x.x connect-source loopback 1 ! If the MSDP router does not use its loopback address as the source address for MSDP traffic, this is a finding.

Fix Text

Configure the router's loopback address to be used as the source address when originating traffic. 1. Create loopback interface. ICX(config)#interface loop 1 ICX(config-lbif-1)#ip addr x.x.x.x/32 2. Set the loopback interface as source for MSDP peers. ICX(config)#router msdp ICX(config-msdp-router)#l msdp-peer x.x.x.x connect-source loop 1

Additional Identifiers

Rule ID: SV-273664r1110903_rule

Vulnerability ID: V-273664

Group Title: SRG-NET-000512-RTR-000011

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.