Avaya Configuring IP Services Bedienungsanleitung Seite 190

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Configuring IP Services
6-24 114065 Rev. A
You can use simplified regular expressions to configure BGP-4 accept and
announce policies for AS pattern matching.
To configure a BGP-4 accept policy with Site Manager:
1. Select Protocols > IP > Policy Filters BGP-4 > Accept Policy
2. Click on the AS Pattern parameter.
3. Use the simplified regular expressions to specify the pattern matching
filter.
To configure a BGP-4 announce policy with Site Manager:
1. Select Protocols > IP > Policy Filters BGP-4 > Announce Policy
2. Click on the AS Pattern parameter.
3. Use the simplified regular expressions to specify the pattern matching
filter.
Best Route Calculation for Equal Routes
BGP uses the following rules (tie breakers) to choose between two equal BGP
routes:
1. Choose the route with the lower route weight.
2. Choose the route with the higher Local Preference attribute.
3. Choose the route with the lower Inter-AS Metric attribute (if both routes
include this optional attribute).
4. Choose the route with the lower interior cost to the Next Hop.
5. Choose external BGP over IBGP.
6. Choose the route with the lower BGP identifier.
7. Choose the route with the lower BGP connection remote address.
8. Choose the route with the lower BGP connection local address.
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