# BGP IPv6 Route Filtering on Cisco IOS

**URL:** <https://forum.networklessons.com/t/bgp-ipv6-route-filtering-on-cisco-ios/1238>\
**Category:** Lessons Discussion\
**Created:** [December 29, 2016, 5:39pm UTC](https://forum.networklessons.com/t/bgp-ipv6-route-filtering-on-cisco-ios/1238 "2016-12-29T17:39:49Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![ethel\_13mx](https://cdn-forum.networklessons.com/letter_avatar_proxy/v4/letter/e/ce73a5/32.png) [@ethel\_13mx](https://forum.networklessons.com/u/ethel_13mx)\
**Post date:** [April 10, 2016, 10:19pm UTC](https://forum.networklessons.com/t/bgp-ipv6-route-filtering-on-cisco-ios/1238/6 "2016-04-10T22:19:17Z")

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Hello Rene,

I was doing a LAB and I discovered something interesting and I wanted to ask you why:

which is the difference to have the next route-map here:

```auto
router bgp 21
 no synchronization
 bgp router-id 15.15.15.15
 bgp log-neighbor-changes
 neighbor 2001:DB8:12::1 remote-as 20
 neighbor 2001:DB8:12::1 route-map BLOCK_MAP in &lt;------------
 no auto-summary
 !
 address-family ipv6
  neighbor 2001:DB8:12::1 activate
  neighbor 2001:DB8:12::1 prefix-list NET64 in
 exit-address-family

```

OR HERE

```auto
router bgp 21
 no synchronization
 bgp router-id 15.15.15.15
 bgp log-neighbor-changes
 neighbor 2001:DB8:12::1 remote-as 20
 no auto-summary
 !
 address-family ipv6
  neighbor 2001:DB8:12::1 activate
  neighbor 2001:DB8:12::1 prefix-list NET64 in
  neighbor 2001:DB8:12::1 route-map BLOCK_MAP in &lt;------

```

Both, the router accept the commands but only with the second one works perfectly.

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