Skip to main content
Sign Out

Welcome to Dell

My Account
  • Place orders quickly and easily
  • View orders and track your shipping status
  • Create and access a list of your products
  • Manage your Dell EMC sites, products, and product-level contacts using Company Administration.
Sign In Create an Account Premier Sign In Partner Program Sign In
Contact Us

Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

PDF

Maintaining Existing AS Numbers During an AS Migration

The local-as feature smooths out the BGP network migration operation and allows you to maintain existing ASNs during a BGP network migration.

When you complete your migration, be sure to reconfigure your routers with the new information and disable this feature.
Allow external routes from this neighbor.
CONFIG-ROUTERBGP mode
neighbor {ip-address | ipv6-address | peer-group-name} local-as as number [no prepend]
  • peer-group-name: 16 characters.
  • AS-number: 0 to 65535 (2-Byte) or 1 to 4294967295 (4-Byte) or 0.1 to 65535.65535 (Dotted format).
  • No Prepend: specifies that local AS values are not prepended to announcements from the neighbor.
Format: IPv4 Address: A.B.C.D and IPv6 address: X:X:X:X::X.
You must Configure Peer Groups before assigning it to an AS. This feature is not supported on passive peer groups.

Example of the Verifying that Local AS Numbering is Disabled

The first line in bold shows the actual AS number. The second two lines in bold show the local AS number (6500) maintained during migration.

To disable this feature, use the no neighbor local-as command in CONFIGURATION ROUTER BGP mode.

R2(conf-router_bgp)#show conf
!
router bgp 65123
  bgp router-id 192.168.10.2
  network 10.10.21.0/24
  network 10.10.32.0/24
  network 100.10.92.0/24
  network 192.168.10.0/24
  bgp four-octet-as-support
  neighbor 10.10.21.1 remote-as 65123
  neighbor 10.10.21.1 filter-list Laura in
  neighbor 10.10.21.1 no shutdown
  neighbor 10.10.32.3 remote-as 65123
  neighbor 10.10.32.3 no shutdown
  neighbor 100.10.92.9 remote-as 65192
  neighbor 100.10.92.9 local-as 6500
  neighbor 100.10.92.9 no shutdown
  neighbor 192.168.10.1 remote-as 65123
  neighbor 192.168.10.1 update-source Loopback 0
  neighbor 192.168.10.1 no shutdown
  neighbor 192.168.12.2 remote-as 65123
  neighbor 192.168.12.2 update-source Loopback 0
  neighbor 192.168.12.2 no shutdown
R2(conf-router_bgp)#

Rate this content

Accurate
Useful
Easy to understand
Was this article helpful?
0/3000 characters
  Please provide ratings (1-5 stars).
  Please provide ratings (1-5 stars).
  Please provide ratings (1-5 stars).
  Please select whether the article was helpful or not.
  Comments cannot contain these special characters: <>()\