Wednesday, August 12, 2015

ipv6 fun IOS-XR

In this post I will list some interesting things in  IOS-XR

1st vrf unicast ipv6 max-prefix counts are limited on the small at 32prefixes. So if you want to limit a vrf to less ipv6-prefixes you CAN NOT.

RP/0/RSP1/CPU0:CRCHI1#show run vrf
Wed Aug 12 13:21:32.266 CST
vrf GED01
 description  Network
 address-family ipv4 unicast
  maximum prefix 1000
 address-family ipv6 unicast
  maximum prefix 32    <------HERE

2nd, I found out the mgmt interface  can not participate in IPv6 -RAs. So if you want to advertisea prefixes using the mgmt interfaces it will not work

3rd, when you try to exceed  your max prefixes per that vrf, you will receive a warning and the prefixes that exceeds the limits will be drop.

Next, ipv6 address and ND RA is similar to  IOS. Here's a sample cfg.

Lastly, like other devices, the  max amount of IPV6 prefixes you can advertise is limited by the link MTU size. A 1500byte MTU limits you to approx 32-44 prefixes max depending on your  RA configuration and if you have other goodies and ipv6 DNS, domain or search list.

Ken Felix
NSE ( Network Security Expert) and Route/Switching Engineer.
kfelix  -----a----t---- socpuppets ---dot---com

    ^     ^
=(  *  * )=
      /  \

No comments:

Post a Comment