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V 1 . 1 0  

2.6. Routing Protocol 

Symptom Solution 

Any route policy that uses ACLs defaults to 

permit all

Add an explicit 

deny all

 or 

permit all

 rule at 

the end of all ACL statements. 

The OSPF command, 

abr-summary not 

advertise

 is not working correctly. 

The 

abr-summary not advertise

 command 

does not filter the initial route in a summary 
update.  For example, 128.213.64.0/19 filters 
the routes 128.213.65.0 to 128.213.95.0 but 
does not filter 128.213.64.0. 

If necessary, configure an ACL to filter the 
route. 

Changing the OSPF Area on an interface will 
delete the OSPF configuration on that 
interface. 

Save the OSPF configuration file before the 
change. 

Changes to an access list are not applied until 
the route policy is reapplied. 

Reapply the route policy immediately after 
making changes to the access list. 

The 

display bgp route

 command only shows 

one route even if multiple (backup) routes are 
available. 

The display only shows detail information for 
the best route. 

RIP MD5 Authentication types are ambiguous. 

For RIP MD5 Authentication, use the default 

non-standard 

value. This is the most common. 

Routing does not function correctly, in a virtual 
template with multilink PPP and OSPF 
configuration. 

When using MP with OSPF, you must 
configure 

OSPF peer

 

ipaddress

When using a serial DTE interface, the OSPF 
cost may not be set correctly. 

Set the OSPF cost for the DTE manually. 

BGP places all internal peers into one peer 
group by default, 

To configure different policies for one peer, 
place that peer in a separate peer group and 
define policies for that peer group. 

The router supports only 15,000 entries.  
Receiving over 15,000 BGP routes may cause 
the router to hang. 

Arrange with the local ISP to filter routes before 
updates can reach the router. 

With Routing Policies, matching next-hop 
based on IP prefix list does not actually match 
the next BGP hop. 

Use ACL instead of prefix-list. 

Toggling route-reflection with a connection 
established causes the router to reboot. 

Shut down the interface before toggling route-
reflection. 

A route policy specified in a peer group does 
not take effect after a reboot, 

Reenter the route-policy after the router has 
returned to service. 

Poison Reverse is not supported in this 
release. 

Poison Reverse is not supported in this 
release. 

2.7. Multicast Protocol 

Symptom Solution 

The router does not support IP multicast 
forwarding without the multicast routing 
protocol. 

Keep PIM-SM or PIM-DM enabled on the 
interface to insure multicast runs correctly. 

Enabling 

ip unnumbered

 on a PIM-SM 

interface disables PIM-SM routing. 

Do not configure 

ip unnumbered

 on a PIM-SM 

interface. 

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