internal configured, BGP advertises the metric configured in the redistribute command as
MED.
• If BGP peer outbound route-map has metric configured, all other metrics are overwritten by this
configuration.
NOTE: When redistributing static, connected, or OSPF routes, there is no metric option. Simply
assign the appropriate route-map to the redistributed route.
The following table lists some examples of these rules.
Table 6. Redistributed Route Rules
Command Settings BGP Local Routing
Information Base MED Advertised to Peer
WITH route-map
metric-type internal
MED Advertised to Peer
WITHOUT route-map
metric-type internal
redistribute isis (IGP cost
= 20)
MED: IGP cost 20 MED = 20 MED = 0
redistribute isis route-
map set metric 50
MED: IGP cost 50 MED: 50 MED: 50 MED: 50 MED: 50
redistribute isis metric
100
MED: IGP cost 100 MED: 100 MED: 100
Ignore Router-ID for Some Best-Path Calculations
The Dell Networking OS version 8.3.1.0 and later allows you to avoid unnecessary BGP best-path
transitions between external paths under certain conditions. The bgp bestpath router-id ignore
command reduces network disruption caused by routing and forwarding plane changes and allows for
faster convergence.
Four-Byte AS Numbers
The Dell Networking OS version 7.7.1 and later supports 4-Byte (32-bit) format when configuring
autonomous system numbers (ASNs).
The 4-Byte support is advertised as a new BGP capability (4-BYTE-AS) in the OPEN message. If a 4-Byte
BGP speaker has sent and received this capability from another speaker, all the messages will be 4-octet.
The behavior of a 4-Byte BGP speaker is different with the peer depending on whether the peer is a 4-
Byte or 2-Byte BGP speaker.
Where the 2-Byte format is 1-65535, the 4-Byte format is 1-4294967295. Enter AS numbers using the
traditional format. If the ASN is greater than 65535, the dot format is shown when using the show ip
bgp commands. For example, an ASN entered as 3183856184 appears in the show commands as
48581.51768; an ASN of 65123 is shown as 65123. To calculate the comparable dot format for an ASN
from a traditional format, use ASN/65536. ASN%65536.
Traditional Format DOT Format
65001 0.65501
65536 1.0
100000 1.34464
Border Gateway Protocol IPv4 (BGPv4) 187