Hi Tobias,
Not that the load of redistribution with IPv6 would be much due to the
table size of IPv6, however I'd generally recommend a design that avoids
the need to redistribute BGP tables into other routing protocols (also
especially avoid redistributing any other routing protocols into BGP).
Alternative #1: Typically router0 in your scenario would be a non BGP
speaking customer aggregation router that either can't run BGP or that
you don't want to run BGP. I'd suggest having router1 inject a default
(default-originate) into ospf and then have router0 use that instead for
reaching the Internet at large as well as any routes carried in BGP and
not ospf. This would eliminate the need to redistribute BGP into ospf.
Alternative #2: If the /48 route is not meant to be announced to the
Internet at large (and either on an interface or statically routed) then
I'd suggest carrying it in ospf on all three routers and not in BGP.
Alternative #3: I'd suggest running BGP on all three routers (probably
not applicable to your situation).
Mike.
Tobias König wrote:
Hi there
I ran into a problem when trying to redistribute a bgp ipv6 route into ospf.
The scenario looks the following:
router0 <-- ospf (10:10:10::4/126) --> router1 <-- bgp (10:10:10::/126) -->
router2
Router2 advertises an ipv6 prefix (20:20:20::/48) via ibgp to router1, this
part works flawlessly.
Router1 should then redistribute that route into its ospf process and
advertise it to router0, which unfortunately it doesn't.
(When redistributing a static route on router1 into ospf, router0 sees that
prefix).
Maybe someone of you got any idea of what could be wrong or can provide a
hint on where to find detailed infos.
You can find the according configs at the bottom. The config was tested with
the following platforms and IOS -> always the same result:
c2800nm-advipservicesk9-mz.124-19
c3640-js-mz.124-23.bin
c3640-ik9s-mz.124-19.bin
Thanks in advance for any inputs.
Cheers
Tobias
---- sh ipv6 route
R0#sh ipv6 route
C 10:10:10::4/126 [0/0]
via ::, FastEthernet0/0
R1#sh ipv6 route
C 10:10:10::/126 [0/0]
via ::, FastEthernet1/0
C 10:10:10::4/126 [0/0]
via ::, FastEthernet0/0
B 20:20:20::/48 [200/0]
via 10:10:10::2
R2#sh ipv6 route
B ::/0 [200/0]
via 10:10:10::1
C 10:10:10::/126 [0/0]
via ::, FastEthernet0/0
S 20:20:20::/48 [1/0]
via ::, Null0
Config:
=====
router0:
----
interface FastEthernet0/0
ipv6 address 10:10:10::5/126
ipv6 enable
ipv6 ospf 1 area 0
ipv6 router ospf 1
router-id 10.10.10.0
log-adjacency-changes
passive-interface default
no passive-interface FastEthernet0/0
----
router1:
----
interface FastEthernet0/0
ipv6 address 10:10:10::6/126
ipv6 enable
ipv6 ospf 1 area 0
!
interface FastEthernet1/0
ipv6 address 10:10:10::1/126
ipv6 enable
!
router bgp 10
bgp router-id 10.10.10.1
bgp log-neighbor-changes
neighbor 10:10:10::2 remote-as 10
neighbor 10:10:10::2 version 4
!
address-family ipv4
no neighbor 10:10:10::2 activate
no auto-summary
no synchronization
exit-address-family
!
address-family ipv6
neighbor 10:10:10::2 activate
neighbor 10:10:10::2 send-community
neighbor 10:10:10::2 default-originate
neighbor 10:10:10::2 soft-reconfiguration inbound
no synchronization
exit-address-family
ipv6 router ospf 1
router-id 10.10.10.1
log-adjacency-changes
passive-interface default
no passive-interface FastEthernet0/0
redistribute bgp 10
----
router2:
----
interface FastEthernet0/0
ipv6 address 10:10:10::2/126
ipv6 enable
!
router bgp 10
bgp router-id 10.10.10.2
bgp log-neighbor-changes
neighbor 10:10:10::1 remote-as 10
neighbor 10:10:10::1 version 4
!
address-family ipv4
no neighbor 10:10:10::1 activate
no auto-summary
no synchronization
exit-address-family
!
address-family ipv6
neighbor 10:10:10::1 activate
neighbor 10:10:10::1 send-community
neighbor 10:10:10::1 soft-reconfiguration inbound
network 20:20:20::/48
exit-address-family
!
ipv6 route 20:20:20::/48 Null0
----
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