Routing protocols' seed metrics for redistributing
When routes are redistributed into another routing protocol, their metrics are also translated to different values depending on vendor implementation and routing protocol which the routes are being redistributed to. Tables below show what value will be chosen when redistributing between protocols with no default metric configured explicitly, that is called as “seed metric”.
The seed metrics listed below are picked from Juniper vSRX and Cisco IOS-XRv default behavior.
Juniper vSRX
| from \ to | ospf | isis | rip | bgp (med) |
|---|---|---|---|---|
| direct | 0 (E2) |
0 (L1/L2) |
0 |
none |
| static | 0 (E2) |
0 (L1/L2) |
0 |
none |
| ospf | – | ospf metric (L1/L2) | 0 |
ospf metric |
| isis | isis metric (E2) | – | 0 |
none |
| rip | rip metric (E2) | rip metric (L1/L2) | – | rip metric |
| aggregate | 0 (E2) |
10 (L1/L2) |
0 |
none |
| bgp | bgp med (E2) | 10 (L1/L2) |
0 |
– |
Cisco IOS-XRv
| from \ to | eigrp | ospf | isis | rip | bgp (med) |
|---|---|---|---|---|---|
| connected | variable (*1) | 20 (E2) |
0 (L2) |
(x) variable | 0 |
| static | (x) 2^32-1 |
20 (E2) |
0 (L2) |
(x) variable | 0 |
| eigrp | – | 20 (E2) |
0 (L2) |
(x) variable | eigrp metric |
| ospf | (x) 2^32-1 |
– | 0 (L2) |
(x) variable | ospf metric |
| isis | (x) 2^32-1 |
20 (E2) |
– | (x) variable | isis metric |
| rip | (x) 2^32-1 |
20 (E2) |
0 (L2) |
– | rip metric |
| bgp | (x) 2^32-1 (*2) |
1 (E2) (*2) |
0 (L2) (*2) |
(x) variable | – |
- (x):
default-metricmust be configured to redistribute- (x)
2^32-1: Default metric is squashed by max value even whendefault-metricis configured. Note that redistribution cannot be done withoutdefault-metric. - (x) variable: Metric specified by
default-metricis assigned.
- (x)
- (*1): Composite metric calculated from interface metrics
- (*2):
router bgp <ASN>; bgp redistribute-internalstatement is required to restribute
